For lead-acid batteries from 6 to 24 V/DC. This battery switch can be used to charge 2 rechargeable batteries separately using a power source such as a car alternator, solar power system, wind turbine, battery charger and so on. For charging currents up to max. 10 A (20 A with cooling). The charging current is distributed so that flat batteries are charged more strongly than almost full ones. Ideal for running TVs, radios and so on from one rechargeable battery in camper vans and keeping a second battery fully charged for ignition. Also useful in holiday homes to prevent the alarm system's rechargeable batteries from running down.