1. Ordinary gel battery: The fingerboard of an ordinary battery is composed of lead and lead oxide, and the electrolyte is an aqueous sulfuric acid solution. The main advantages are stable voltage and low price, but the disadvantages are low energy (that is, the electric energy stored per kilogram of battery), short service life, and frequent and regular maintenance.

　　2. Dry gel battery: The official name is dry-type rechargeable lead-acid battery. The main feature is that the cathode fingerboard has a higher capacitance. The electricity obtained under completely dry conditions can be saved in less than two years.

　　3. Maintenance-free colloidal battery: Due to the advantages of its own structure, the maintenance-free battery consumes very little electrolyte and basically does not need to be supplemented with distilled water during its service life. It also has the characteristics of impact resistance, high temperature resistance, small size, and small self-discharge. The service life is usually twice that of ordinary batteries. There are also two types of maintenance-free batteries on the market: one is to add electrolyte at the time of purchase, and no maintenance is required for future use (adding supplementary fluid), and the other is that the battery itself has been filled with electrolyte and sealed before being shipped out of the factory.