dell INSPIRON 2650 battery

Compressor impeller design meridian plane shape as shown in Figure 1.

) flow channel design features. Impeller Inlet Section of smaller radius of curvature of the type line, dell laptop battery,,and zero angle of the design, so as to better adapt to low-flow fuel cell operating battery conditions. Adopt a more narrow leaves, Inspiron 1000,to meet the needs of small low-speed flow has high pressure ratio requirements. Because of low specific speed characteristics, when appropriate in the design of the impeller outlet width widened in order to reduce the relative speed of the impeller, thereby reducing the layered effect.

) short without battery Vaneless Diffuser Design. Centrifugal Compressor Diffuser necessary to the impeller exit as much as possible of the kinetic energy into static pressure can be. Centrifugal compressor for the car, and often adopts Vaneless Diffuser, Inspiron 1000, Inspiron 2200, 312-0292
INSPIRON 2600, INSPIRON 2650,its internal fluid flow approximation logarithmic curve. For low specific speed centrifugal compressor impeller, the impeller exit of the tangential velocity u high, but the relative speed of air flow w and the radial velocity along the blade is relatively low, leading to its absolute speed c of the radial direction and great angle α shown in Figure 2. Fluid in the absence of Vaneless Diffuser paragraph to the flow of weeks long, sharp increase in battery friction loss, and vulnerable to the phenomenon have returned. In order to reduce or even avoid such losses, improve the efficiency of gas pressure, using a relatively short period of no Vaneless Diffuser.

) scroll design features. Exports because of the air in the impeller radial velocity is very smal and little traffic, so the design of low battery specific speed centrifugal compressor using a smaller diameter spiral case.

Mobile phone battery explosion-proof variable hand grenades Raiders (1) Inspiron 1000,

Mobile phone battery explosion:

Why mobile phone batteries can explode? The most fundamental reason is that consumers do not use the security of fake and shoddy battery. Battery is a certain danger of chemical industrial products, if they are over-voltage, over-charge batteries, etc. will be fever, does not meet the safety standards of the battery product is likely to cause combustion, explosion. The fake batteries usually cheap, failed to meet the national standard batteries and materials, and some even failed to protect the circuit board or the protection circuit or aging, is more use of recycling used batteries to do raw materials for production dangerous self-evident.

Experts in the safe use of mobile phones ideas:

A manufacturer who told this writer, the battery of security risks exist not only mobile phones. At present,Inspiron 1000, Inspiron 2200, 312-0292
INSPIRON 2600, INSPIRON 2650, a variety of battery has become the modernization of the basic equipment, mobile phones, notebook computers,Inspiron 2200, all kinds of portable devices can not be separated from the battery, if we adopt the low-quality batteries or used improperly, these batteries may have happened the explosion.

Currently used by mobile phone batteries for lithium battery, battery explosion generally has three.

First, the reasons for the battery itself. As a result of internal defects in the battery, the battery does not recharge itself, does not discharge the case of the explosion.

Second, rechargeable batteries have a long-term. Lithium batteries in a special temperature, humidity and bad situation or the environment may have substantial transient discharge currents, triggering spontaneous combustion or explosion.

Three, short-circuit. The smaller the possibility. In addition, consumers will be mobile phones or inflammable materials on the high temperature side, it may cause an explosion.

312-0292,

11-Feb-2009

AT switching power

Switching power supply that is controlled through the circuit switch to high-speed pass with cut-off Road. The DC into high frequency alternating current to the transformer to transformer, resulting in the required one or more voltage! Huawei to high-frequency alternating current is due to high frequency AC battery transformer in the transformer circuit efficiency is much higher than 50HZ. Therefore, switches can make a small transformer, but the work is not very hot! ! Low cost. If you do not will 50HZ into high-frequency switching power supply that does not make sense! !Inspiron 1000, Inspiron 2200, 312-0292
INSPIRON 2600, INSPIRON 2650, Switch transformer nor mysterious. Is an ordinary transformer! This is the switching power supply. Switching power supply can be roughly divided into two kinds of isolation and non-segregation, isolation-type transformers must have switches, rather than isolation may not necessarily have.

In short, switching power supply of the working principle is:

1. AC power input into DC by the rectifier filter;

2. The adoption of high-frequency PWM (pulse width modulation) signal control switch tube, the DC will be added to switch on the transformer primary;

3. Switch the high frequency induction transformer secondary voltage,INSPIRON 2600, the load supply via rectifier filter;

4. Output in part through a circuit back to the control circuit to control the PWM duty cycle to achieve a stable output purposes.

AC power input when the general has to go through one Eritrean asthenosphere things, filtering down-line interference, but also filter out the interference power on the grid;

Power is the same, the higher the switching frequency, switching transformer size smaller, but switch the request of the higher;

Switch transformer secondary windings can have more than one or a multiple tap winding has to be the required output;

General should also be some additional protection circuit,Inspiron 1000, Inspiron 2200, 312-0292
INSPIRON 2600, INSPIRON 2650, such as no-load, short circuit protection, etc., or may be burned down switching power supply.

Say the above is the approximate switching power supply works.

In fact, now have a very high integration ASIC can make a very simple external circuit, INSPIRON 2650,and even free to do debugging.

The development of computer switching power supply, after AT, ATX, ATX12V three stages of development. AT standard introduced by IBM earlier PC / AT machines proposed to provide +5 V,-5V, +12 V,-12V voltage four groups, with hard switching. ATX standards have epoch-making significance, realize the soft boot shutdown, Wake on LAN via remote, an increase of +3. 3V, +5 VSB output. ATX12V is the development of CPU and other hardware products, mainly an increase of +12 V output capacity

Doubling Laptop Battery Life

Doubling Laptop Battery Life

Anyone who uses a laptop on an airplane would love a single battery to last through a trans-American flight.dell laptop battery, Now researchers at Intel believe that they can double a laptop's battery life without changing the battery itself. Instead, they would optimize power management--system wide--of the operating system, screen, mouse, chips inside the motherboard, and devices attached to USB ports.

To be sure, manufacturers and researchers have been exploring piecemeal ways to make portable computers more energy efficient. Operating systems are designed to deploy power-saving screen savers and put an entire system to sleep if its owner hasn't used it after a while. And Intel's forthcoming Atom, a microprocessor for mobile Internet devices, can be put to sleep at up to six different levels, depending on the types of tasks that it needs to do.

But the problem with these approaches is that they're not coordinated across the entire deviceInspiron 630m,. Intel's prototype power-management system is aware of the power that's used by all parts of a laptop, as well as the power requirements of a person's activity, and it shuts down operations accordingly, says Greg Allison, business development manager. The project, called advanced platform power management, was demonstrated on Wednesday at an Intel event in Mountain View, CA.

Allison gives this example: today, when a person reads a static e-mail, the screen still refreshes 60 times a second, and peripherals such as the keyboard, mouse, and USB devices drain battery power while awaiting instructions. "We're burning energy even when we don't need to," Allison says. In this situation, Intel's system would save power by essentially taking a snapshot of the screen that a person is reading and saving it to a buffer memory. So instead of refreshing,Inspiron 640m, the screen would maintain an image until a person tapped a button on the keyboard or moved the mouse (the keyboard and mouse would also stay asleep until activated).

All the while, the operating system will be monitoring use of other applications, restricting operations to those that aren't being actively used. And if there are any devices plugged into a USB port, such as a flash-memory stick, the system would put them to sleep. At the same time, explains Allison, energy-monitoring circuits on Intel chips Y9943,will put unnecessary parts of the microprocessor to sleep. It takes 50 milliseconds for the entire system to spring to life, he says, a length of time imperceptible to the user.

Intel isn't the first to think of the idea of integrating power-saving technology throughout a device. One Laptop per Child (OLPC), the nonprofit that builds inexpensive, rugged laptops meant for children in the developing world, set the standard with a gadget that consumes one-tenth of the power of a conventional laptop. Granted, OLPC's laptop doesn't have the capabilities of consumer machines, but it does show what is technically achievable.

There are definitely advantages to this systemic approach, says Seth Sanders, a professor of electrical engineering and computer science at the University of California, Berkeley. "Comprehensively looking through the system at all of the different pieces that are cycling unnecessarily provides an opportunity [for power savings]," he says.

Allison says that the company is already talking with operating-system vendors to explore what it would take to integrate this approach into software. RC107And as a major contributor to the new USB 3.0 standards, Intel will have some say in how much power forthcoming USB devices will use. In addition, Allison says, the company is trying to secure deals with display and hardware vendors. "This won't happen in the next three years," he says. But he suspects that pieces of the new power-management system will find their way into laptops within five years.

Sony VGP-BPS8 battery

Original Sony VGP-BPS8 batteryNew High Quality Sony VGP-BPS8 battery

Sony VGP-BPS8 battery Description:
Type: Li-ion
Capacity: 4800 mAh
Volt: 11.1 V
Size: 0
Color: Silver

HOUSTON -- ExxonMobil Chemical continues to extend laptop battery

HOUSTON -- ExxonMobil Chemical continues to extend its technology leadership with the development of two new grades of V series co-extruded battery separator films. These new developmental grades will help make lithium-ion batteries (LIB) safer than ever before for hybrid and electric vehicles,dell laptop battery, power tools and electronic devices including laptop computers.

Featuring improved thermal stability and lower shutdown temperature for a higher safety margin, the developmental grades add to the company’s battery separator film portfolio that includes the award-winning V-series separator films introduced in 2007. Based on the same advanced co-extrusion technology platform and proprietary wet bi-orientation manufacturing process as V-series separator films,INSPIRON 2600, INSPIRON 2650, 1G222, BAT3151L8
Latitude X300, W0465, Inspiron 2000, Latitude LS the developmental grades can help prevent thermal runaway in batteries while providing LIB designers more flexibility in selecting electrode systems and formats in battery designs to improve power and capacity density.

Higher Safety Margin with Excellent Performance Balance

Each of the new developmental grades offers safety-margin enhancements.INSPIRON 2650, Developmental grade 1 extends thermal stability with an improvement in transverse direction shrinkage to 8%, at 130ºC for 30 minutes, from 35.5% in previous-generation separator films.

Developmental grade 2 has a significantly improved shutdown temperature of 128˚C, compared to 134˚C for a standard V series grade, and maintains a longer insulation period with higher meltdown functionality.

“These developmental grades demonstrate our technology leadership advancement and commitment to the LIB industry in developing safer and better-performing batteries,” said Jim Harris, senior vice president, ExxonMobil Chemical. “The enhanced performance characteristics of these new separator films will enable battery companies to develop smaller and more powerful batteries, including those required for next-generation,1G222, lower-emission vehicles.”

ExxonMobil Chemical currently manufactures battery separator films in Nasu, Japan, and is building a manufacturing facility in Gumi, Korea, to accommodate additional demand and serve global customers reliably and efficiently. The new manufacturing plant will be completed in 2010.

About ExxonMobil Chemical

ExxonMobil Chemical is one of the world’s premier petrochemical companies with manufacturing, technology, and marketing operations around the world. The company delivers a broad portfolio of products and solutions efficiently and responsibly, with a commitment to create outstanding customer and shareholder value.

ExxonMobil Chemical endorses the principles of sustainable development,INSPIRON 2600, INSPIRON 2650, 1G222, BAT3151L8
Latitude X300, W0465, Inspiron 2000, Latitude LS including the need to balance economic growth, social development and environmental considerations.BAT3151L8, To learn more, visit www.exxonmobilchemical.com.

Note to Editors

The term "ExxonMobil Chemical" refers collectively to some or all of the companies affiliated with Exxon Mobil Corporation, and/or itself, which have chemical manufacturing and/or marketing operations around the world.

Gala and auction set at Westwood

Westwood Elementary School is hosting its 12th annual art gala and silent auction from 6 to 8 p.m.

The event includes student artwork, a silent auction of themed baskets, and an ice cream social. Latitude X300,All proceeds from the auction will go toward classroom equipment and supplies.

Clayton Valley has e-waste drive

Clayton Valley High School's second annual e-waste drive will take place from 9 a.m. to 3 p.m. Saturday, April 25, in the school parking lot, 1101 Alberta Way, Concord.

Items accepted include monitors, towers, laptops, televisions, stereos, copiers, fax machines, DVD/CD/VHS players, cell phones, car batteries, cardboard, metal, and paper.

Proceeds benefit the Clayton Valley High School Safe and Sober Grad Night celebration.

For information, call Pamela Newacheck

Alhambra High School will hold a fundraising night from 5 to 8 p.m. Friday, May 1,W0465, at Chavinda Mexican restaurant, 514 Center Ave., Martinez. This includes dine in, take out, and/or phone orders

There will also be a major clearance sale of student store items such as sweatshirts, sweatpants, shirts and hats, for purchase that evening at the restaurant.

For information, contact Marianne Griffin, student activities director, at mgriffin@martinez.k12.ca.us.

Pizza fundraiser to help Valhalla

The Valhalla Elementary Parent Faculty Association is holding a fundraiser from 2 to 9 p.m. Wednesday, March 25 at Round Table Pizza, 85 Chilpancingo Parkway, Pleasant Hill.

Participants need to present their server with a fundraiser flier, available at www.mdusd.k12.ca.us/valhalla/index.html.

Round Table will donate 15 percent of all sales to Valhalla's Parent Faculty Association.

Consent Decree meetings planned

Residents are invited to attend a meeting regarding the Consent Degree,Inspiron 2000, a document handed down by the Federal Court in May 2000 to address systemic deficits in how special education services are delivered in the Mt. Diablo Unifed School District.

The meetings will update parents/guardians of children with disabilities and Section 504 Plans and others on the current status of the Consent Decree and provide an opportunity for input concerning special education programs and services within the district.

Meetings are scheduled for:

-- 2 to 4 p.m. Monday, April 6, Pine Hollow Middle School Library, 5522 Pine Hollow Road, Concord.

-- 7 to 9 p.m. Tuesday, April 7, Concord High School, Multi-Use Room, 4200 Concord Blvd.

-- 7 to 9 p.m. Wednesday, April 22, Pleasant Hill Education Center, One Santa Barbara Road.

-- 3 to 5 p.m. Thursday, April 23, Mountain View Elementary Parent Information Center, (Room A-1) 1705 Thornwood, Concord.

Spanish interpreters will be provided. Interpreters for the deaf will be provided at the 7 p.m. April 7 session at Concord High School.Latitude LS, Interpreters for the deaf will be provided at other sessions upon request. Contact the Consent Decree office at 925-682-8000, Ext. 4292 by March 26.

Forum for middle school parents

The transition from elementary school to middle school can be confusing and frustrating for parents. The Pleasant Hill Education/ Schools Advisory Commission will host a forum, "Navigating the Middle School Years," from 7 to 9 p.m. Wednesday, March 25, at Sequoia Middle School, 265 Boyd Road, Pleasant Hill.

Powering GM's Electric Vehicles

Powering GM's Electric Vehicles

General Motors (GM) recently announced that it is developing two types of plug-in hybrid vehicles, cars designed to run exclusively or almost exclusively on electricity for daily commutes. (See "GM's New Electric Vehicle" and "GM's Plug-In Hybrid.") But the announcements came with this caveat: the battery technology isn't ready, dell laptop battery,and production will have to wait. In reality, the battery technology is actually quite close to being ready.

Indeed, GM's vehicle chief engineer, Nick Zielenski, says that individual batteries are already good enough. "We've got enough data at the cell level to feel that the technology is there," he says. What remains to be done is packaging the cells into large battery packs and testing them in actual vehicles. This will be a challenge, Zielenski says, since there is a big difference between using "a single cell and multiplying them all together to get the energy levels that we need for this type of vehicle." But according to development contracts GM recently signed with two groups of companies, such battery packs will be ready for testing in vehicles by the end of this year.

Making batteries for vehicles, especially plug-in hybrids,Inspiron 4000, is very challenging. For accelerating and climbing hills, the battery pack has to deliver enough power to supply the electricity demand of several houses at once. The energy storage capacity required to give a vehicle a 40-mile range would be enough to power a laptop in continuous use for weeks. Yet the space on board for such a battery pack is limited. "What we need is a very reliable and long-lived battery that has also got quite high energy density so we can find a place for it in the car," says Peter Savagian, director of hybrid power-train systems at GM.

Developers also need to make packs that can survive extremes in temperature and constant vibrations on the road,Inspiron 4100, and still last the life of a vehicle. And they have to make the batteries safe. Last year millions of laptops were recalled because of the danger of their batteries bursting into flame. A plug-in hybrid would have the equivalent of hundreds of laptop battery packs bundled together.

Remarkably, at the level of individual cells, many of these problems have already been addressed. Lithium-ion batteries have much higher capacity than the lead acid batteries used in electric cars in the past, and even more than the nickel-metal hydride used in hybrids today. According to GM, its new Chevrolet Volt concept vehicle stores the same amount of energy as the company's EV-1 electric vehicle, but in just one-third the area. And while lead acid battery packs have to be replaced every couple of years, new lithium-ion batteries seem from lab tests to be able to last 10 years or more.

New lithium-ion batteries are also safer and less expensive than those in a laptop.Inspiron 2500, One of the companies under contract with GM to develop battery packs is A123 Systems, based in Watertown, MA. It has developed a nanostructured iron phosphate­-­based electrode that is much safer than the cobalt-oxide laptop batteries that were recalled last year. For example, while a cobalt-oxide battery will burst into flame if punctured by a nail, the A123 battery merely releases innocuous wisps of steam. (See "Safer Lithium-Ion Batteries.") A123 is already producing millions of its batteries for use in professional power tools, and now it has developed a new, larger cell designed to be more rugged and hold more energy. The company has also modified the electrolyte to make the battery able to operate very well at -20 ˚F or temperatures up to 140 ˚F. As a result, "the car can operate in Scandinavia, in Patagonia, or in the summer in the middle of a tropical city," says Ric Fulop, cofounder and vice president of business development at A123 Systems.

At this point, cost may still be an issue. But that will change as more of the cells get made. "At the end of the day, it's a scale game," says Alan Mumby, CEO of a joint venture between Johnson Controls, in Milwaukee, WI, and Saft, in Paris, France. The venture has been awarded one of the two contracts for developing battery packs for GM .

Overall, "the fundamental tool kit--the weight, volumetric efficiency, the demonstration of life in a lab basis, Latitude CPX, and safety through extensive testing--have all

been demonstrated," says David Vieau, president and CEO of A123 Systems. "So this is not a pie in the sky. However, the actual execution of all functionality in cells in actual vehicles hasn't been done."

Although integrating the batteries into large packs is a challenge, in fact it has been done before. According to Scott Lindholm, vice president of systems engineering at Cobasys, based in Orion, MI, which is teaming with A123 Systems on the GM contract to develop battery packs, many of the problems involved in making lithium-ion battery packs are similar to those the company has already solved for the nickel-metal hydride packs it already produces for GM hybrids. What's more, several companies have already made large lithium-ion battery packs for vehicles. For example, Hymotion, based in Ontario, has used A123's power-tool batteries to make kits for converting the Toyota Prius into a plug-in hybrid. Indeed, its design is one of the contenders for converting hundreds of New York State's government-owned hybrids into plug-in hybrids. These packs are smaller than that used in GM's Volt concept vehicle, but companies such as Tesla Motors have already successfully engineered lithium-ion packs that are a few times larger than GM's pack.

The question is whether such packs can be engineered to have the life, safety, and cost that GM wants. Latitude C600, As it is, these battery packs can cost tens of thousands of dollars, placing them out of the range of most consumers. But part of the cost has to do with scale, and that should change if GM puts the vehicle into production. The price is also coming down as the batteries are used in other applications, such as power tools.

In all, it seems as though battery technology is falling into place, just as demand for more fuel-efficient cars is rising. "It's really exciting for us to be in this business," says Fulop. "The timing ended up quite nice. We developed these products,Latitude C610, and the plug-in-hybrid thing is really happening."

A Better Battery for Laptops

A Better Battery for Laptops

Boston-Power ramps up production of its long-lasting battery.

Staying power: These battery cells are capable of recharging up to 80 percent of their capacity in 30 minutes, and they retain 80 percent of their strength after three years. The image on bottom shows a side-by-side comparison of the heat given off by two batteries generating the same level of energy: on the left is a battery from a current market leader, and on the right, Boston-Power’s Sonata battery. The green colors represent cooler temperatures. dell laptop battery,High temperatures can lead to explosive battery malfunction. (The brightly colored section outlined in black represents the batteries. The remaining area shows heat emitted by the laptop.)

Credit: Boston-Power

Boston-Power says that it's poised to enter the market for portable power, with a notebook battery the company claims is safer, lasts longer, and can be charged faster. The Westborough, MA, startup recently announced that it is more than tripling production of its high-performance battery, called the Sonata, after receiving $45 million in a third round of venture financing. The move puts the company in a position to mass-produce and commercialize its next-generation lithium-ion battery within months.

"In partnership with GP Batteries, one of Asia's largest battery manufacturers, G5266,we now have our second factory up and running in the greater China region," says Christina Lampe-Onnerud, the company's founder and CEO. In 2002, Technology Review named Lampe-Onnerud one of its top innovators under the age of 35 for her efforts to develop better-performing lithium-ion batteries with less volatile substances. Based on that research, she founded Boston-Power in 2005. Now, after raising $68 million in total, she says that her company will be able to manufacture a million battery cells per month by the end of 2008.

Oak Investment Partners, based in Westport, CT, provided this latest infusion of capital, building upon earlier investments by Venrock Associates, Granite Global Ventures, and Gabriel Venture Partners.

Although the Sonata will not offer greater energy capacity per use--with a four-hour run time, its performance will be average for the market--the company hopes that the battery's three-year life span, innovative safeguards, and ability to recharge quickly will help it gain a foothold in the battery market. As opposed to existing notebook batteries, which can take an hour to recharge to 80 percent capacity, the Sonata can reach that same level in just 30 minutes, Latitude CPi, according to Boston-Power. And whereas current batteries degrade very quickly, permanently losing up to 50 percent of their capacity within months, the Sonata retains up to 80 percent of its capacity over three years. In fact, since the typical laptop battery tends to degrade very rapidly, the Sonata will have a greater per-use capacity in the long run.

To make the cell retain its capacity over its lifetime, Boston-Power found it necessary to change the current lithium-ion design. The company identified a combination of new chemistry mixtures and electrode compositions, and it created a new shape--all of which enables a consistent performance over the cell's lifetime. The different shape made it possible for the company to increase the volume of the cell and more efficiently use the space within a battery pack, allowing it to reach energy-storage levels competitive with current conventional batteries.

In the past, it has been very difficult to make lithium-ion cells larger, since a larger energy density creates a potential for greater catastrophic malfunctioning. Conventional lithium-ion batteries use cobalt oxides, but the substance has been partly responsible for some of the more dramatic laptop explosions in recent years. So instead of using cobalt,Inspiron 8200, which also tends to degrade quickly, the company incorporated manganese. Boston-Power isn't the only company using manganese; other companies, such as Compact Power, are also trying to take advantage of its stability. Boston-Power is incorporating the element into a larger than average cell.

GM to Build Its Own Batteries

Just as the company makes engines, it will now make battery packs for electric cars.

Better Batteries Charge Up

A startup reports progress on a battery that stores more energy than lithium-ion ones.

An Electrifying Startup

A new lithium-ion battery from A123 Systems could help electric cars and hybrids come to dominate the roads.

A Cheaper Battery for Hybrid Cars

New lead-acid batteries could achieve high performance.

Longer-Lasting Batteries for Laptops

New materials improve the reliability, safety, Inspiron 8000, and storage capacity of lithium-ion batteries.

A New Deal for EEStor

A delayed battery technology may indeed be on the way.

Battery Breakthrough?

A Texas company says it can make a new ultracapacitor power system to replace the electrochemical batteries in everything from cars to laptops.

Safer, Higher-Capacity Batteries

Silver-zinc battery chemistry could replace lithium ion in laptops and other electronics--if such batteries can be made cheaply enough.

New Batteries Readied for GM's Electric Vehicle

The technologies behind the battery Inspiron 8100, packs for the GM Volt are being tested and could be ready within a year.

Super-Charging Lithium Batteries

Nanowire electrodes could improve the performance of electric vehicles.

HP's Longer-Lasting Laptop Battery

HP's Longer-Lasting Laptop Battery

The new battery, developed by the startup Boston-Power, will be available next year.

HP will be the first laptop maker to offer a new battery designed toHP's Longer-Lasting Laptop Battery

The new battery, developed by the startup Boston-Power,dell laptop battery, will be available next year.

HP will be the first laptop maker to offer a new battery designed to maintain its energy capacity over the life of a laptop, according to an announcement from the battery maker, Boston-Power, based in Westborough,dell laptop battery MA. The battery will be available as an option for some HP laptops starting next year.

The capacity of most batteries fades markedly after just a few months, making it hard to predict how long a laptop will last between charges. Boston-Power says that the new battery will last three years without fading and that it charges to 80 percent capacity in just 30 minutes.

The battery, which has been certified by more than one environmental organization for green design and manufacturing,Inspiron 6000, should also be safer than ordinary laptop batteries, which have been known to catch fire.

For more details on the battery design and chemistry, see "A Better Battery for Laptops."

Update: In a conversation this afternoon, Christina Lampe-Onnerud, the company's CEO and founder, said that the initial HP charging systems won't be able to take advantage of the 30 minute charging time, although doing so will require relatively simple changes that will be available soon. Inspiron 9300,She also said the company has started work on a battery for electric cars, and expects to have news on this front next year.

Apple Ensures Laptop Obsolescence

A bigger, better battery means consumers must toss their laptop when the battery wears out.

The new 17-inch MacBook Pro. Credit: Apple

Apple announced a handful of somewhat interesting features and products at Macworld in San Francisco today, including new features in iLife '09, the ability to wirelessly download songs on the iPhone, iTunes music without digital rights management restrictions, and a new MacBook Pro. But the announcement that caught my eye was a new battery design for the MacBook Pro: it essentially limits the lifetime of the new laptop, ensuring its worthlessness after the battery dies.

Apple's team of dedicated engineers specializes in making batteries that fit into the sleek cases that houses its laptops. And in the new MacBook Pro, the engineers aimed for a battery that was thin and holds more energy than ever. At the keynote, Phil Schiller, vice president of products at Apple,Inspiron 9400, claimed that the battery lasts eight hours, depending the use, and can be recharged 1000 times, giving it an effective lifetime of about five years.

The trick to improving the battery charge, however, was increasing its size by about 40 percent. And the limited volume within a laptop case meant that the engineers had to take something out. The component that got the boot is the housing that allows the battery to be removed and replaced when it wears out. (A great explanatory video is here.)

This means that the lifetime of the laptop itself is directly tied to the lifetime of the battery, ensuring its uselessness and disposability in five years. While Apple touts itself as a company concerned with the environment, limiting the reuse of its technology seems to blatantly ignore environmental concerns.

Apple surely anticipated this criticism. At the keynote, Schiller displayed a slide that flaunted the MacBook Pro's "environmental checklist": it's arsenic-free, BFR-free, mercury-free, has a PVC-free system, is highly recyclable, 34% smaller packaging, and a 1000-recharge battery.

Still, when those 1000 charges are up, the laptop doesn't get another life. 310-6321,It heads to the shredder.*

*Apple confirmed late Tuesday that the MacBook Pro 17'' batteries can be replaced professionally for an additional cost of $179.

maintain its energy capacity over the life of a laptop, according to an announcement from the battery maker, Boston-Power, based in Westborough,dell laptop battery MA. The battery will be available as an option for some HP laptops starting next year.

The capacity of most batteries fades markedly after just a few months, making it hard to predict how long a laptop will last between charges. Boston-Power says that the new battery will last three years without fading and that it charges to 80 percent capacity in just 30 minutes.

The battery, which has been certified by more than one environmental organization for green design and manufacturing, should also be safer than ordinary laptop batteries, which have been known to catch fire.

For more details on the battery design and chemistry, see "A Better Battery for Laptops."

Update: In a conversation this afternoon, Christina Lampe-Onnerud, 310-6322,the company's CEO and founder, said that the initial HP charging systems won't be able to take advantage of the 30 minute charging time, although doing so will require relatively simple changes that will be available soon. She also said the company has started work on a battery for electric cars, and expects to have news on this front next year.

Apple Ensures Laptop Obsolescence

A bigger, better battery means consumers must toss their laptop when the battery wears out.

The new 17-inch MacBook Pro. Credit: Apple

Apple announced a handful of somewhat interesting features and products at Macworld in San Francisco today, including new features in iLife '09, the ability to wirelessly download songs on the iPhone, iTunes music without digital rights management restrictions, and a new MacBook Pro. But the announcement that caught my eye was a new battery design for the MacBook Pro: it essentially limits the lifetime of the new laptop, ensuring its worthlessness after the battery dies.

Apple's team of dedicated engineers specializes in making batteries that fit into the sleek cases that houses its laptops. D5318, And in the new MacBook Pro, the engineers aimed for a battery that was thin and holds more energy than ever. At the keynote, Phil Schiller, vice president of products at Apple, claimed that the battery lasts eight hours, depending the use, and can be recharged 1000 times, giving it an effective lifetime of about five years.

The trick to improving the battery charge, however, was increasing its size by about 40 percent. And the limited volume within a laptop case meant that the engineers had to take something out. The component that got the boot is the housing that allows the battery to be removed and replaced when it wears out. (A great explanatory video is here.)

This means that the lifetime of the laptop itself is directly tied to the lifetime of the battery, ensuring its uselessness and disposability in five years. While Apple touts itself as a company concerned with the environment, limiting the reuse of its technology seems to blatantly ignore environmental concerns.

Apple surely anticipated this criticism. At the keynote,G5260, Schiller displayed a slide that flaunted the MacBook Pro's "environmental checklist": it's arsenic-free, BFR-free, mercury-free, has a PVC-free system, is highly recyclable, 34% smaller packaging, and a 1000-recharge battery.

Still, when those 1000 charges are up, the laptop doesn't get another life. It heads to the shredder.*

*Apple confirmed late Tuesday that the MacBook Pro 17'' batteries can be replaced professionally for an additional cost of $179.