The serviceable storage battery possesses low self-discharge, and after full charge gives that number of ampere-hours which corresponds to its capacity. In process of wear the self-discharge of the accumulator increases, internal resistance increases, and capacity - falls.
1. Before starting test of the battery, it needs to be loaded. For this purpose use that charging device which you usually use together with this battery. If it uses lithium (for example, lithium - polymeric or lities-iron is lithium-ion), use only factory devices. Other accumulators can be charged also with self-made devices. Surely observe charging mode. It is the most convenient to charge the battery of the cell phone directly in the device.
2. Now you need loading. As that the tiny glow lamp well approaches. Load current has to be equal to rated current of discharge of the battery. Consistently with loading turn on the ampermeter, and parallel to it - the voltmeter.
3. Periodically (for example, each ten minutes) write down indications of both devices in the table. If desired it is possible to conduct also continuous observation, using function of video in the mobile phone. Direct lens of phone to measuring tools. Finish tests and sort chain when tension decreases to minimum admissible for this type of the battery (it depends on type of electrochemical system and the number of cans).
4. On measuring results make schedules of voltage variation and current depending on time. Calculate battery capacity, having determined the area of the figure formed by the schedule of dependence of current from time. Compare it to specified on the accumulator jar. to this indicator and also on shrinkage of tension at the end of discharging cycle, draw conclusion on expediency of further operation of the battery.
5. If the battery is unsuitable for further operation, carry out its training by carrying out several slow cycles of charge discharge. In the batteries allowing replacement of separate cans, the way stated above reveal the most worn-out and replace. In case the battery is unsuitable for further operation even after the training, hand over it for processing in special collection point.