9-step 12V / 12.8V 1.25A sealed battery saving charger & maintainer for AGM; GEL & STD 12V and works with 12.8V Li-Ion made batteries with LiFe & LFP technology. Note: Quad program – select program 1 or 3 to charge battery direct or through a live (hot) 12V socket; or program 2 or 4 to charge through BMW CAN-bus controlled 12V socket. Will require optional cable accessory to connect to socket. - Fully automatic and safe charger / trickle charger for 24-7 use - BMW CAN-bus compatible; automatic activation - Smart desulphation from 0.5V; for Pb (conventional lead acid) batteries - Low voltage recovery & BMS reset; for LFP battery - Tests battery state of health - Energy saving technology - Stand-by power less than 0.5W - Efficient 24-7 battery maintenance - Weatherproof - Rated for use down to -40°C / -40°F - No risk of overcharging - Sparks suppressed - Safe for vehicle electronics - Safe for long-term battery maintenance - Automatic shut-down if short-circuited or battery disconnected - Includes weatherproof battery lead; battery clip set & hanging hook.