Have you ever wondered how your battery disappeared when it was not used? This is actually the self-discharge phenomenon of the battery. If the battery capacity drops by more than 3% every day and night within 1 month after full charge, it may be fault self-discharge. In order to avoid this situation, this paper will introduce the causes and preventive methods of battery self-discharge.

Reason 1: Long-term storage

When the battery is stored for a long time, sulfuric acid will sink, resulting in potential difference between the top and bottom of the plate, thus causing self-discharge. In addition, if the spilled electrolyte accumulates on the surface of the battery cover, the positive electrode and the negative electrode may form a path, resulting in power loss.

Reason 2: The electrolyte is impure.

If the electrolyte is impure, or the material of the battery electrode plate is impure, then a potential difference may be formed between impurities and the electrode plate, and different impurities deposited on the electrode plate, and partial discharge will be generated through the electrolyte, so that the battery will be "slimmed down".

Reason 3: the active material of the electrode sheet falls off.

The active material of the battery plate falls off, and too much sediment in the lower part may lead to short circuit of the battery plate, and the upper and lower layers of battery electrolyte may also cause self-discharge.

How to prevent it?

In order to avoid battery self-discharge, we need to check the battery regularly. If you don't use it for a long time, you can take it out and put it in a dry and ventilated place for regular charging. In addition, the electrolyte of the battery also needs to be replaced regularly to ensure its purity.