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Dry charged lead-acid battery: Its full name is dry charged lead-acid battery. Its main feature is that the negative electrode plate has a high storage capacity. In a completely dry state, it can store the obtained electricity for two years. When in use, only electrolyte needs to be added, and it can be used after 20-30 minutes.

Maintenance-free batteries: Due to their structural advantages, maintenance free batteries consume very little electrolyte and do not require distilled water supplementation during their service life. It also has the characteristics of shock resistance, high temperature resistance, small size, and small self discharge. The service life is generally twice that of a regular battery. There are also two types of maintenance free batteries on the market: the first type is to add electrolyte at the time of purchase and do not require maintenance during use (adding supplementary liquid); Another type is that the battery itself is already filled with electrolyte and sealed when it leaves the factory, so users cannot add any additional liquid at all