Whether you have a vehicle in storage, or your battery has just run low, you can Charge and maintain your 12-Volt batteries at optimal capacity for peak performance and extended lifespan. This unit automatically selects charge rate and adjusts from rapid charge to trickle charge to maximize battery life, compensates for low voltage and temperature extremes. It has a powerful 50 Amp Engine Start rapidly helps to get the battery charging process started. Alternator Check monitors the alternator to determine operational performance and the battery reconditioner has electric pulse technology which can help reverse sulfate build-up on battery plates to improve charging carrying capability and extend battery life. Plus there is also a handy voltage meter to check the battery and indicate battery voltage level.. 50A Engine Start helps start most batteries up to V8. 15 Amp Battery Charger for 12V Lead Acid or 12V Lithium/LifePO. Maintainer sustains battery charge level. Amperage (A): 50 A. Charger type: AC. Features: Battery Test Function,Engine Start Function,Reverse Polarity Protection. Pack Size: 1. Product Weight (lb.): 2.12 lb. Voltage Output (volts): 12 V. Product Height (in.): 2.5 in. Product Width (in.): 8 in