Laptop Battery Life Barrier

Laptop Battery Life Barrier
The key to preventing dell BAT3151L8 battery failures is to minimize any misuse and to track their capacity and other key characteristics. A battery monitoring program will identify a rapidly deteriorating battery before it actually fails.
The first part of a battery monitoring program is to regularly measure their capacity. Capacity is the amount of charge available from a battery, measured in ampere-hours (Ah) for large cells, milliampere-hours (mAh) for smaller cells. A typical AA size battery has a rated capacity of 600mAh, thus it can supply 600mA for at least one hour or 100mA for at least six hours. Manufacturers conservatively rate dell Latitude X300 battery capacity so that, in general, the measured capacity (which we discuss below) should be greater than the rated amount.
The basic concept used by all dell W0465 battery analyzers to check capacity is to connect the battery to a known accurate constant current load and monitor the voltage as the battery discharges .
When the battery voltage reaches a predetermined value (the cut off voltage), the load is disconnected and the elapsed time recorded. The battery capacity is simply the load current times the elapsed time in hours. Normally, you would start this test with a fully charged battery. You can check a battery’s capacity using this method with only a resistor as load, a voltmeter, and a stop watch. Alternately, you can use a commercial battery analyzer (such as the Ultimate Battery Analyzer our company makes).
There are many commercial analyzers available, ranging in price from $200 to $2000 or more. The best one for you depends on features you need and your budget. The less expensive models are limited in their accuracy and customization. The more expensive models allow you to test more types of dell Inspiron 2000 battery and many batteries at once.
Operation of all the commercial units is similar: first, connect a power source to the analyzer, an AC plug, a wall adapter (power supply) or a 12V battery. Specify the battery being tested (i.e. a Motorola 550 cell phone) or specify the test conditions (i.e. number of cells, charging and discharging current, depth of discharge). Then connect the analyzer to the battery that is being tested. Press the start button and leave the analyzer and battery alone for a few hours. The analyzer discharges the battery, measures the discharge time then recharges the batteries. After the discharge is completed the analyzer shows your dell Latitude LS battery’s capacity.
The measured capacity depends on the following factors: dell u4873 battery,dell d5318 battery temperature, discharge current, cut-off voltage, and the battery’s prior history. Below room temperature (20 degree C) battery capacity is reduced. You should make all your measurements between 18 degree C and 25 degree C.
What discharge current should you use? Most manufacturers (Sanyo and Panasonic for example), measure capacity at a discharge rate of C/5, which is called the five hour discharge rate. For example, a typical AA cell of 600mAh capacity would have a ‘C’ of 600mA and a C/5 of 120mA. Others measure capacity at a discharge rate of C. Like all batteries, the higher the discharge current, the less the available capacity. For example, the available capacity with a discharge at C/5 is about 10% more than that with a discharge at the C rate. Another possible discharge current would be the actual current drain of the dell 2834T battery while being used. I recommend that you discharge at between C and C/2.
Tags: No Comments HP Breaks the 24-Hour Laptop Battery Life Barrier
Posted in battery news on 07/28/2009 02:37 am by admin
Holy moly, talk about being charged up! HP claims its new EliteBook 6930p can deliver up to 24 hours of battery runtime, or 5 hours longer than Dell’s Latitude E6400, provided it comes equipped with an optional ultra-capacity dell 4834T battery.
“All-day computing has been the holy grail of notebook computing,” said Ted Clark, senior vice president and general manager, Notebook Global Business Unit, HP. “With the dell laptop battery customers no longer have to worry about their running out before their work day is over.”
While we can’t rule out a dose of voodoo magic as a contributing factor, much of the credit goes to the Intel 80GB SSD drive and 14.1-inch mercury-free Illumi-Lite LED display, both of which laptop battery says are required add-ons to make the feat possible. And that’s not with a wimpy processor either - the least powerful CPU in the 6930p’s lineup is an Intel Core 2 Duo P8400. Toss a spill resistant keyboard and an inner magnesium shell into the mix and DELL has one tough mother on its hands.