A7： Yes, it will get hot during charging. This is because when charging, the current passing through the battery causes an internal chemical reaction in which some of the energy is converted into heat. This internal reaction causes the battery to generate heat, so the surface of the battery will feel warm and sometimes even become hot. The amount of heat generated depends on a variety of factors, including the battery's charging rate, charger design, ambient temperature, and the condition of the battery (for example, whether the battery is over-discharged). Under normal use conditions, moderate heat is normal, but if the battery is abnormally hot, it may indicate a problem that requires inspection and treatment.