How to ascertain the lithium iron battery quality

Lithium-iron Laptop battery by using different materials and processes as well as rigorous quality control to varying degrees, but it was a big difference. In particular, greater price difference. The prices between high and low are almost twice.

Why is there such a difference in Na? So why lithium iron batteries will be so good cheer? Where is the difference? How to choose?

The production of lithium-iron battery and environmental requirements of the production process are more stringent, a neglect of non-performing rate slightly will improve immediately reduce the price it had lower standards. Because of this, some grade B or C grade will flow on the market. As lithium-iron Dell Inspiron 1501 battery is still a relatively new, many buyers today do not know whether it is also, therefore, wishes to provide some distinguishing features of this method and the importance of the battery for your reference.

Lithium-iron battery is good or bad judgments, the most basic points that can be analyzed from the following:

1. Uniformity

Battery harder to do is homogeneous, but the largest chain of battery is also homogeneous. If the 10 batteries strung, there is a first to arrive on-protection standards of the discharge, while several others are still plenty of power, this string of hp 361742-001 battery pack that can power capability is not all over low? Were made with a first place is the same reasoning.

The inconsistency of the battery without the added protection board is very easily broken, it is easy to overload or excessive discharge; have unprotected board sony VGP-BPS2A battery pack may be using more electricity capacity will also be more weak. There is also a lot of battery factory launched the production of batteries, but it was not necessary for the chain of causes product group. And the whole manufacturing process is very strict to achieve uniformity in controlling.

Simple Test Method: Series 4 batteries, so 1C and 3C charge-discharge, and the concept of charge-discharge process of the investigation, the battery voltage to see if differences in the lifting of the situation will. It is better to do 4 to 5 times.

2. Self-discharge rate

Lithium iron battery self-discharge rate, the theoretical value must be less than 2% per month over this value is not a good Dell 75UYF battery. Not a problem in the method is to use the material in question.

Low-rate self-discharge has always been the characteristics of lithium-iron battery, if self-discharge rate, when you install finished goods delivered to customer sites, he had no power, and customers feel? And a lot of energy wasted.

Channel in the group context, it will affect the balance of the hp PB992A battery, the battery can be installed less, and that the battery life is reduced.

Method of simple test: take roughly equal to the capacity of the battery 10, the congestion charge put aside for a month after switching on, then measure the value of the ability to calculate the self-discharge rate. (The sets aside a call after that amount of voltage value, what changes in battery voltage.)

3. Charge-discharge rate (load C-rate)

Quick charge and discharge is actually a lithium-iron batteries, one of the most advantageous because of its fast charge and discharge, which has very similar characteristics and a super capacitor but its super-capacitor capacitor important than hundreds of times. If the charge-discharge characteristics sufficiently rapid, the use of lithium-iron apple A1079 battery is not very meaningful.

In general, the charging rate of good quality lithium-iron battery is 3C (about 20 minutes power saturation charge), while the speed can reach 30 degrees centigrade. Special needs can achieve a higher magnification of the charge and discharge. The above situation is quite the battery life is the premise.

Method of simple test is, in order to manufacturer specifications can be used to test the maximum load, the rate of discharge, if the testing process, the cells fire very serious, then the quality of BTP-43D1 batteries n is not very good.

4. Stages

In general, the user can not be measured, and can only trust the data supplied by the manufacturer or appointed by a professional unit on behalf of the measure. Good quality lithium-iron batteries, in 3000 the use of 1C charge cycles and discharge its electricity capacity; mitigation will be less than 15%.

In short, the lithium iron Dolphin alone, the problem spots are not large, but after the series parallel connection to use and the features described above should give special attention to the. Especially in the high strings high voltage VGP-BPS2B batteries power capacity in the group, but also pay particular attention to the quality of batteries.

Chinese Government Sells Lenovo Parent Stake

A privately owned Chinese group will buy a stake in Lenovo’s parent company being sold by a Chinese government academy, the companies said Friday.

China Oceanwide Holdings Group will buy the 29 percent share in Legend Holdings, Lenovo’s parent company, for 2.76 billion yuan (US$404 million), a Legend spokeswoman said Friday. A China Oceanwide representative confirmed the deal.

The deal places more control of Lenovo’s parent in the hands of private investors, which could influence its business strategy.

The stake is being sold by the Chinese Academy of Sciences, a state-run institution that conducts national research projects. China Oceanwide was the only buyer who met the conditions set in the academy’s sale notice, the Legend spokeswoman said. The academy required that the buyer agree not to resell its stake, alter Legend’s strategy or propose changes to the company’s management for five years. The academy will retain a 36 percent stake in Legend, leaving it the company’s largest investor.

China Oceanwide controls companies in industries including real estate, banking and energy.

Legend and China Oceanwide said details of the deal and Legend’s new strategy would be available at a briefing next Tuesday. Lenovo declined to comment.

Lenovo, the world’s fourth-largest PC maker, began restructuring early this year to refocus on its business in China and other emerging markets. The global economic recession dealt a heavy blow to the company’s operations in developed markets. The company has posted net losses for the last three quarters

Chinese Government Sells Lenovo Parent Stake

A privately owned Chinese group will buy a stake in Lenovo’s parent company being sold by a Chinese government academy, the companies said Friday.

China Oceanwide Holdings Group will buy the 29 percent share in Legend Holdings, Lenovo’s parent company, for 2.76 billion yuan (US$404 million), a Legend spokeswoman said Friday. A China Oceanwide representative confirmed the deal.

The deal places more control of Lenovo’s parent in the hands of private investors, which could influence its business strategy.

The stake is being sold by the Chinese Academy of Sciences, a state-run institution that conducts national research projects. China Oceanwide was the only buyer who met the conditions set in the academy’s sale notice, the Legend spokeswoman said. The academy required that the buyer agree not to resell its stake, alter Legend’s strategy or propose changes to the company’s management for five years. The academy will retain a 36 percent stake in Legend, leaving it the company’s largest investor.

China Oceanwide controls companies in industries including real estate, banking and energy.

Legend and China Oceanwide said details of the deal and Legend’s new strategy would be available at a briefing next Tuesday. Lenovo declined to comment.

Lenovo, the world’s fourth-largest PC maker, began restructuring early this year to refocus on its business in China and other emerging markets. The global economic recession dealt a heavy blow to the company’s operations in developed markets. The company has posted net losses for the last three quarters.

Samsung Brings Windows 7 to Netbooks

Samsung will use Windows 7 Starter Edition on two new netbooks, it announced on Thursday.

Both the N130 and N140 will come with the Starter Edition of Microsoft’s upcoming operating system, but Samsung isn’t putting all its eggs in the Windows 7 basket. Windows XP Home Edition is also an option on both devices, according to a statement.

The two devices have the same hardware specification, including an Intel Atom N270 or an N280 processor, a 10.1-inch screen and up to a 250 GB hard drive. The latter is only available with the Windows 7 version.

The biggest difference between the two computers is battery life. Using a 6-cell battery, the N140 should last for up to 11 hours, compared to 7.5 hours for the N130, according to Samsung.

The N130 also includes optional support for mobile broadband technologies HSPA (High-Speed Packet Access), WiMax and WiBro, which is a South Korean version of mobile WiMax.

Both models are expected to start shipping in September. The N130 will cost between €349 and €399 (US$500 and US$570). Pricing for the N140 adds €50 to both sides of that price span.

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.