When the new vehicle battery is charged and discharged, and the working capacity of the battery is tested, it is necessary to discharge according to certain specifications to check whether the capacity of the battery meets the rated capacity.
The discharge of the battery is to discharge the current of 1/20 of the rated capacity of the battery until the voltage of each cell is 1.75V.
The voltage should be measured every 2h after starting to discharge. After the voltage drops to 1.8V, the voltage should be measured once every 15 to 20 minutes because the voltage drops rapidly. When the voltage drops to 1.75V, the discharge should be stopped immediately, otherwise the voltage will drop sharply. to “0” or even burn out the plate, and make the next charging difficult.
There are many specific discharge methods, such as: discharge with light bulbs; discharge with variable resistance; discharge with electrolyte and discharge with batteries with lower voltage, etc., which can be selected according to specific conditions. In the discharge circuit, the current must be connected in series; the voltmeter must be connected in parallel, so as to observe the voltage value in time and stop the discharge without losing time.
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