How to test your batteries
The key to preventing dell 6y270 battery,dell 75uyf 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 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 c1295 battery,dell gd761 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 kd476 battery,dell td347 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 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 g5266 battery,dell hd438 battery while being used. I recommend that you discharge at between C and C/2.