The battery is divided into two types: dry and wet. The dry battery (without the lid can be opened to add water) is generally not used for maintenance. The new battery is usually replaced in about two years. Wet battery should pay attention to the scale of the battery water. Do not let it be lower than the lowest scale line or higher than the highest scale line. If it is not enough water, add battery replenisher or distilled water (at the battery store or general car boutique). Sell) Do not add stock solution to prevent the concentration from being too high. When it is not used for a long time, it is generally necessary to recharge the battery and reuse it.