The G15000 is a portable automatic battery charger and maintainer for both 12V and 24V lead-acid and lithium-ion batteries. Designed for charging cars, boats, RVs, SUVs, or Diesel Trucks. It monitors the battery for safe and efficient charging without any overcharge. It comes complete with a built-in battery desulfator to rejuvenate underperforming and sulfated batteries. It also comes equipped with an integrated JumpCharge mode for rapid charging with a five minute cycle to start dead batteries.