There are many kinds of automobile batteries, but most of them are lead-acid batteries. However, no matter what kind of battery, we know that there are actually chemical reactions, and only chemical reactions will definitely lead to energy gains and losses. So when we buy a new battery, the materials used in it are generally in the best state, with good sealing and good heat dissipation. When we use it for a long time, it will produce a lot of "garbage" inside the battery, which will further affect the energy gain and loss in the chemical reaction, that is, generate more heat energy. Moreover, the material at this time has been corroded and deteriorated to varying degrees, which will make its heat dissipation performance worse. Therefore, after a long period of use or even a new battery just bought (due to design and material problems, or storage methods before reaching users, or even futures), the battery may be charged and heated.