Multiple banks A three bank onboard battery charger rated a 30 amps 10 amps per bank for 12 volt batteries, including marine, boat, starter, and deep cycle batteries. Enjoy precision charging An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over charging in hot climates and under charging in cold climates.Operating Temperature: 4 to 104 F ( 20 to 50 C) Charge dead batteries Charges batteries as low as 1 volt. Or use the all new force mode that allows you to take control and manually begin charging dead batteries down to zero volts. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.