Connect 12V alternating current in series, and connect a small electric bead or resistor in series between the batteries for current limiting. First, use a small current to activate, make the control loop alternating current to tens of milliamperes, and maintain it for 30 to 60 minutes, and then increase the current to 1 to 2 times the nominal value of the battery. For example, if a 1000 mAh battery is added to 1000 to 2000 mAh, it will activate for 30 to 60 minutes. During the above process, the temperature and appearance of the battery should be observed: there should be no abnormal phenomena such as hot, smoke, bulging, etc., and the current should be appropriately reduced if the temperature is too high (above 40°C). Lithium-ion batteries that have undergone the above activation treatment can generally be used normally, but they cannot be compared with new batteries!
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