The self - discharge rate is an important characteristic of lithium - polymer batteries. It refers to the rate at which the battery loses its stored electrical energy over time when not in use. In lithium - polymer batteries, self - discharge occurs due to several factors.

　　One of the main causes is the chemical reactions within the battery. The electrolyte in the lithium - polymer battery contains various chemical substances. Even when the battery is not connected to an external circuit, there can be side reactions between the electrolyte and the electrodes. For example, the electrolyte may react with the positive electrode material, gradually consuming the active substances on the electrode surface and leading to a reduction in the battery's capacity.

　　Another factor contributing to self - discharge is the presence of impurities in the battery components. Impurities in the electrodes or the electrolyte can act as catalysts for unwanted chemical reactions, accelerating the self - discharge process. Additionally, the design and manufacturing process of the battery also play a role. If there are defects in the battery's internal structure, such as poor contact between the electrodes and the electrolyte, it can facilitate self - discharge.

　　Typically, the self - discharge rate of lithium - polymer batteries is relatively low compared to some other types of rechargeable batteries. Under normal storage conditions (room temperature and moderate humidity), the self - discharge rate may be in the range of a few percent per month. However, this rate can increase significantly under certain conditions. For instance, at higher temperatures, the chemical reactions occur more rapidly, resulting in a higher self - discharge rate. If the battery is stored for a long time, the cumulative self - discharge can lead to a significant loss of capacity. To mitigate the impact of self - discharge, proper storage conditions are crucial. Storing the battery at a moderate temperature (around 20 - 25°C) and in a dry environment can help minimize self - discharge.

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