The misunderstanding of laptop battery repeatedly charge and discharge deeply

The article comes from http://www.mylaptopbattery.co.uk/blog/2009/08/30/the-misunderstanding-of-laptop-battery-repeatedly-charge-and-discharge-deeply/

 Notebook computers equipped with original equipment batteries, after a period of time after use, there will inevitably be of standby time. Some users said: “The depth with repeated charge and discharge method, you can restore the performance of the DELL laptop battery, thereby extending battery life,” I think this to be relatively one-sided.

To understand this issue correctly, may start with the battery type used in laptop computers start with. As you know, before 1995 the production of notebook computers are basically nickel-cadmium batteries to power. The battery is in use, if the charge-discharge method is not correct, the battery will have a “memory effect”, thereby reducing the battery’s actual capacity to eliminate this “memory effect” is used repeatedly in the best way to charge and discharge depth way. With the emergence of nickel-metal hydride batteries, battery capacity has significantly improved, but the “memory effect” did not completely eliminate the shortcomings.
In recent years, lithium-ion batteries in notebook computers has been rapidly growing popularity, due to lithium-ion batteries have basically eliminated the “memory effect” problem, it is used repeatedly to restore the battery depth of charge and discharge performance of the method no longer applies. However, lithium-ion batteries why I still appear to reduce the capacity of the problem? The root causes of that situation, is used in notebook computers and the original lithium-ion battery built-in battery management system in the making.
Battery Management: At present, in notebook computers, almost all adopted the “battery management” and “charge-discharge control” two kinds of chip-level management system. The “battery management chip” placed in a notebook inside the chip to store the register of the computer used in the capacity of lithium-ion batteries, working temperature, ID, serial number, charge and discharge status, charging and discharging the accumulated frequency of important information. The data information in the use of the process, according to the actual situation of continuously updated. The battery built-in “charge-discharge control chip,” the most important role is to monitor and control the battery charge-discharge process as a whole and be documented dell C1295 battery,dell GD761 battery,dell TD347 battery.
Charge: Lithium-ion battery charging process of the whole, divided into “fast charge constant-current” and “constant-voltage charging current decreasing,” two phases. The so-called “constant-current fast-charge” means a charge has just begun when the charge current is fixed and the charge voltage to follow the battery terminal voltage gradually increased until it reaches the nominal voltage charging. When the battery terminal voltage has reached the standard value, the control chip will be automatically transferred to the “Constant current charge decreasing” phase, this time charging voltage will no longer continue to rise, while the charge current is to follow the battery capacity is rising gradually decreasing and finally reached zero, and so will complete the entire battery charging process.
In the meantime, the process of charging the charge arising from voltage, current, time and other data curves will be recorded in the cell are known as “charge-discharge control chip” in memory. “Battery Management IC” is through the retrieval of these data, and is calculated by sampling data such as battery capacity, which is what we read in the Battery Information where the value of Wh.
Fixed: After repeated charging and discharging the battery after use, its built-in chip in the charging and discharging of data will of course change. If at this time “battery management chip” has no chance to re-read the newer, more complete data, it calculated battery capacity would of course not accurate, and to the user the impression that the battery capacity has decreased, but the reality on the battery capacity and there is no real reduction in the actual. Some brands of notebook computers comes with charging management software works, that is, the process of charging Refresh “charge-discharge control chip” in memory of the data, thus ensuring the “battery management chips,” the correctness of calculations.
If you take a close look over the use of laptop computers instructions, you will find among them the “computer in use one month later, the battery should be to make a full charge and discharge operation” instructions. Its main purpose is to use the depth of charge and discharge a way to modify the charge and discharge control chip registers inside the curve data, so that the battery charge control and the nominal capacity and the actual situation of the battery corresponds to arrive at the correct battery capacity values dell HD438 battery,dell KD186 battery,dell GD761 battery,dell Y9943 battery.

Re-understand notebook lithium battery maintenance

The article comes from http://www.mylaptopbattery.co.uk/blog/2009/08/30/re-understand-notebook-lithium-battery-maintenance/

 For notebook computers, the battery can be said to be a more important component, its performance is directly related to notebook computer environment in the absence of power in the ability to work. The laptop battery can be considered a public component in another letter of consumables, it involves the laptop battery maintenance and reasonable use of the forum is also frequently discussed issue. With regard to laptop batteries at the time set aside to save much more than what should stay and whether the use of AC power when you remove the battery problems are not always what a unified answer. I watch a lot of foreign masters in the experience, it will sum up their general point of view, for your reference. After reading this article, you will find many of their claims and receive the recommendations of our universal existence of a number of differences in the number.

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Li-ion batteries in a life cycle in general can be 300 to 500 times charge-discharge. So many people think that, as long as using less battery, so that you can to a certain extent, played a role in extending battery life. But they did ignore the original battery that the physical nature of the end when the battery off the assembly line, it’s internal life, the clock will then start walking. So even if you do not set aside the battery, lithium battery life was only two to three years you can come to an end of. Battery capacity caused by reasons for the decline was due to oxidation caused by the battery internal resistance increases. When the electrolytic cell resistance reaches a certain point, although this time the battery still be full of electricity, but the battery has been unable to release the stored electricity dell Latitude D600 battery,dell Latitude D610 battery.

Caused by lithium batteries is the speed of this aging temperature and set aside when the charge state of preservation decision. I will give a table to illustrate the different situations of these two factors, the impact on the battery capacity.

Can be seen from the table, high charge state and the high temperature accelerated the decline in battery capacity. Therefore, if possible, as far as possible, after the battery charge to 40% placed in a cool place to save. This allows the preservation of a long period, the battery protection circuit is in its working state. And if the battery is fully charged, will be placed at high temperatures, which will cause great damage to the battery, the table has also been seen, charge 100% in the 60 ° C environmental conservation, 3 months after the battery capacity fell by 40% . Therefore, how to save the battery solved the issue, but also leads to another focus of everyone has been argued, that is when we use a fixed power supply when there is a need to remove the battery? Before the resolution of this question let us first analyze the use of fixed power supply when the battery placed in a computer environment in which … … at this time due to charge notebook computers role in protection circuit, so that the battery remained at 100% of full power state, and this When the battery in which the ambient temperature between 25-30 ° C, at least, if the hot weather, this temperature will be higher, then from the table, you should be very natural to come to a conclusion that it is so to do this would actually damage the battery, causing a decline in its capacity.

But despite the use of laptop computers, high-temperature will bring damage to the battery. But Qudiao battery, use only a fixed supply, there will still some danger that dust and moisture will cause some damage to the battery, while the use of notebook computers in order to avoid a sudden power notebook computers may cause damage, so Manufacturers generally warn users not to remove the battery. Of course, this result will be naturally imagined, your battery as often in such a relatively poor environment, it will not be long over, and then you will need to go to repair center to replace the battery, this way, the benefit of course, is a manufacturer of dell Latitude D620 battery,dell Latitude D800 battery.
Finally we spotlight a lithium battery that is exactly how a reasonable charge and discharge this issue. For the lithium battery is best for partial discharge, rather than fully discharged, and to as much as possible to avoid frequent full discharges. Regular battery too low discharge of the result can only be scrapped so that the battery in advance, because if the battery into every cell of 2.5 volts below the battery’s internal safety circuitry will be switched on, this time the battery will become some bad spent. Therefore, in order to avoid such situations from occurring, do not save the battery power before its release was erased, but rather a number of electric charge in the store before, and again before the first fully charged.
All in all, in order not to make your premature loss of the role of the battery, then the use of normal, you should try to comply with the following principles:
A. avoid full discharge, and often for lithium batteries. The repeated arbitrarily rechargeable lithium battery damage is very small, almost negligible.
B. will need to keep hold of lithium batteries placed in the shade, remember not to put in the refrigerator. Avoid placing hot car, such as a long time to save the battery charge to 40% in place.
C. most of the time if you are using a fixed power supply, please remove the batteries placed in the shade.
D. no need to purchase spare lithium batteries for storage, so this piece is actually a waste of battery.
Battery is brought to use, as long as the attention to rational use and preservation methods, there is no need to care for their excessive, making it possible for its owners contribute more to performance is the most important dell Latitude D830 batterydell Latitude X300 battery.

Nokia Enters Netbook Fray with Booklet 3G

Nokia will join the ranks of netbook manufacturers with a stylish Windows-based offering called the Nokia Booklet 3G. It will have the looks of an Apple notebook and the guts of a PC. The netbook, according to Nokia, will have close ties to the company’s Ovi suite of online services and mobile applications currently available to Nokia handset owners.
The aluminum-encased Booklet 3G will be powered by an Intel Atom processor and deliver up to 12 hours of battery life “enabling people to leave their power cable behind and still be connected and productive,” the company said in a statement. The Booklet can connect to the Internet either by the built-in 3G card or by catching a Wi-Fi signal. It’ll weigh 1.25 kilograms (or just under one pound) and slip by at “slightly more than two centimeters thin (0.7 inches).”
Detailed specs, market availability and pricing will be announced at Nokia World on September 2. But here is what we know, according to details included in Nokia’s press release:

The Nokia Booklet 3G also ships with a GPS unit.
The 10-inch display will be glass, just like Apple’s family of aluminum MacBooks, for improved HD- and media-viewing.
Built-in access to the Nokia Music Store
Netbook will allow you to sync data with your Nokia handset or to a Web-based storage service.
Booklet 3G will have hooks to Nokia’s broad suite of Ovi services that include games, music and video offerings, and office productivity applications.
Judging from Nokia’s press release, the Nokia Booklet 3G will give Apple a low-priced run for its money. Returning students are choosing Windows-based netbooks at a substantially higher rate than Apple laptops, and Nokia grabbed this info and combined the stylish features found in Macs with the low-budget appeal of a netbook.

Survey: Apple’s Lack of Netbook Hurts It With Students

Consumer electronics shopping resource Retrevo says that Apple’s absence from the netbook market is hurting it with students buying laptops. The company has released the results of a study showing the trend.

According to the “Gadgetology” study–culled from Retrevo’s own users–34 percent of students buying laptops are planning to purchase a netbook. Another 49 percent want a full-sized laptop, and the majority of student laptop buyers aren’t considering a Mac.

Students surveyed for the report indicate that longer battery life, small size and light weight are all factors affecting their buying decision, according to Retrevo CEO Vipin Jain, who called 2009 “the dawn of the netbook.”

“Fifty-eight percent of them plan on spending less than $750,” said Jain. Apple offers no laptop in that price range–its least expensive MacBook with educational pricing is $949. Only 18 percent of those students surveyed have a budget exceeding $1,000, according to Retrevo.

Netbooks are an emerging class of laptop computers distinguished by their small size and low cost compared to full-featured general purpose laptop computers. They have limited processing power, storage capacity and memory, but are suitable for surfing the Web, sending e-mail and light productivity work.

Companies like Asus, HP, MSI, and Dell have introduced netbooks into their product lines, while Apple has stayed on the sidelines. When asked by an analyst in July, COO Tim Cook acknowledged that Apple doesn’t “see the way” to build a product it would be happy with at the price point that consumers demand.

“I never want to discount anything in the future, and never want to specifically discuss new products,” Cook cautioned.

During the same conference call, Cook also acknowledged that Apple’s higher ed sales for its third fiscal quarter were flat, with negative growth reported in Apple’s K-12 educational business.

Apple has been rumored to be on the verge of unveiling a new tablet-based product to compete in a lower price bracket than it currently competes, but the company has a long-standing policy of not commenting on rumors, and rarely pre-announces a product before it’s ready to show it to consumers.

Retrevo’s study used more than 300 participants sampled randomly across its monthly visitor base. The sample was distributed across age, gender, income and location areas in the United States. The company claims standard deviation for most questions was 0.498 with a standard error of 0.029.

Windows 7 Worse on Netbook Battery Life Than XP?

Windows 7 cuts almost a third off the battery life of some netbooks shipping today with Windows XP, several recent reviews and user reports say.

Laptop magazine reported in its blog on Monday that during a recent test, a Toshiba netbook lost 2.5 hours of battery life when running Windows 7 instead of XP, or about 30% (6:53 for Windows 7, versus 9:24 for XP).

Web site Tom’s Hardware found last month that an Acer Aspire One netbook running Windows 7’s release candidate lasted 2.5 hours less than when it ran Windows XP Service Pack 3 (5:54 versus 8:28, when both were at a low-power idle state).

Complaints have also surfaced on netbook user forums such as eeeuser.com, for Asus Eee users, AspireOneUser.com, for Acer netbook users, and MSIWind.net, for MSI fans.

The complaints follow gripes that Windows 7 hastens the vampire-like battery drain of running Windows on MacBooks, either in virtualization or via Apple’s Boot Camp software.

Jury’s still out

The reviews are not unanimous. In a late July review comparing the Windows 7 RC versus XP on Asus’ long-running Eee PC 1005HA netbook, Legit Reviews found XP to have between a 2% and 8% advantage over Windows 7. And Laptop noted that XP only had a 6% advantage over Windows 7 on an MSI U123 netbook.

But the negative reports are numerous enough that they darken Windows 7’s image as being a sleeker and more-efficient reboot of Microsoft’s long-running operating system, and cast some doubt on its suitability for netbooks, at least today’s models.

Long battery life is one of the key selling points of netbooks, due to their high portability.

Many vendors heavily tweak their netbooks to ensure that they can run a full business day on a single charge, or more.

Microsoft previously promised that Windows 7 would improve laptop battery life by about 11% over Vista.

That would be due to better use of the graphics chip during tasks such as DVD playback, and improvements in the kernel so that CPU can more quickly switch to an idle state when not in use, and generally run more efficiently, says Microsoft (see video from Microsoft’s WinHEC keynote last November).

A Microsoft spokeswoman declined to comment about the recent reviews and reports, but did point to a white paper, last updated June 23, 2009, describing to driver developers and hardware engineers how to optimize hardware and components for better battery life under Windows 7.

Of course, battery life for Windows Vista was widely perceived to be worse than under XP, due to its bloated codebase, which prevented Vista from running well on netbooks, as well as the poor availability of Vista drivers for many months after its launch.

Hardware drivers and how they interact with an operating system are key for battery drain. For instance, a driver that fails to let Windows turn off a Wi-Fi chip when users aren’t surfing the Web could accidentally result in poor battery life. Same with a graphics driver that isn’t able to shift processing work from an overtaxed CPU to a fresh GPU.

Be patient, says analyst

Jack Gold, an independent research analyst, says that it’s still too early to condemn Windows 7. “[With release candidates,] Microsoft often has debug code inserted to find and document problems, and the code is not optimized,” Gold said. “Same is true of the preliminary drivers available.”

Drivers are not written by Microsoft, but by the component makers themselves, he said. Rather than simply recycling their Vista drivers, the hardware vendors need the final release of Windows 7, which only arrived last month, and “a little time to perform their magic.”

While existing Windows XP netbooks may miss out on some of these optimizations, future models that ship with Windows 7 pre-installed may eventually have the same or longer battery life than XP that Microsoft has promised.

“It does not trouble me that current machines have less than optimum battery life, or performance for that matter. With all the resources Windows 7 will use on a device, optimization will take a little while to complete,” Gold said