Lithium-ion batteries are designed with some waterproofing in mind, so short-term rain exposure generally won't cause serious damage. However, if the battery bulges, it usually means water has entered, and continued use is unsafe. Furthermore, if the battery gets wet in the rain, it's recommended to let it dry completely before using it again. Before reusing it, it's best to check its voltage, resistance, and capacity parameters to avoid potential safety issues from direct charging.
It is particularly important to note that although lithium batteries have some water resistance, they are not suitable for prolonged immersion in water. Prolonged rain immersion or contact with other water sources can cause internal short circuits, damaging the battery and potentially causing a fire. Therefore, when using devices equipped with lithium batteries, avoid placing them in environments where they may be exposed to water for extended periods.
In general, although lithium batteries have a certain degree of water resistance, it is still necessary to avoid prolonged contact with water during use and storage, especially to prevent water from entering or submerging the battery, in order to ensure safety and extend battery life.
