The EverStart MAXX BC50BE 15 Amp Battery Charger and Maintainer helps to charge and maintain 12V AGM GEL and WET compatible batteries. 50 Amp engine start starts the battery charging process in 60 seconds. Alternator check indicates potential alternator issues. Easy-read LCD screen shows operation. The smart charge microprocessor automatically selects charge rate and adjusts from rapid charge to maintainer to maximize and maintain battery life. The electric pulse technology can help reverse sulfate build up on battery plates to improve charging and carrying capacity and extend battery life. New. Portable.