Upgraded 20A Heavy Duty Battery Charger Battery Charger is made with copper coil, metal and ABS casing, weighing 11.5 lb. Designed to charge, maintain and repair all 12-volt and 24-volt lead-acid automotive, 12V-20 Amp, 24V-10Amp marine and deep-cycle batteries including AGM, GEL, EFB, SLA,Flooded(WET), Calcium in cars, truck, SUVs, ATV, motorcycle, snowmobile, lawn mower, boat, tractor, forklift, golf cart, etc. Which is much faster than 10A or 6A automatic chargers. NOTE: LITHIUM BATTERY DISABLED. High power, faster charging Battery Maintainer has Fast charge/trickle charge Mode. The battery chargers automobile 12 volt automatically detects 12V and 24V batteries.