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Rechargeable capacity When 0.1C is charged for 16 hours and stored for 28 days at 20 + 5 degrees, the discharge capacity of 0.2C should not be less than 70% of nominal capacity. Overcharge performance At 20 + 5 0.1C, the battery should be continuously charged for 48 hours, and the battery should be free from leakage and deformation. After overcharging test, the effective capacity (0.2C release) should be no less than 36mAh at 1~4 for 20 + 5 centigrade. cycle life After 500 cycles of charge and discharge, the battery capacity should be 60% of nominal capacity. Repeat cycle charge and discharge 1-50 times until any fiftieth discharge time is less than 3 hours, and repeat the 50 charge discharge; if the discharge time is still less than 3 hours, the battery life is terminated. 2 charge and discharge 2.1 When used for the first time, the battery pack must be recharged, even if the battery is charged at the factory. 2.2 in general, battery groups do not advocate fast charging. In emergency situations, we should pay attention to the following points: (1) a special quick charger should be used; (2) the fast charger is used frequently, and the battery group will be affected by varying degrees. (3) fast charger requires strict control of charging time, charging voltage and battery surface temperature. 2.3 in use, do not short circuit or positive and negative reverse charge. 3 matters of attention 3.1 do not short-circuit the battery or reverse charge. 3.2 do not put batteries in the heat source or fire, so as not to cause leakage or even explosion. 3.3 do not disassemble the battery. The electrolyte in the battery is highly corrosive. 3.4 please charge and discharge the battery according to the specified condition.