?10X3,3-Bank, 10A Per Bank?: Marine battery charger for all types of lead-acid & lithium-ion 12V batteries, including marine, boat, starter & deep-cycle batteries. IP68 waterproof fully-sealed charging. Boat battery chargers can be charged 24/7 onboard. ?3 Charging Modes?: 12V SLA/AGM, 12V LITHIUM, 12V CALCIUM. 3 batteries can charge at the same time. Each battery can independently select the suitable mode via press "MODE". ?Force Mode?: Onboard marine battery charger charge dead batteries. When battery is lower than 1V, you can manually begin charging: Only press and hold the “MODE“ button for 5s. ?Auto Repair Mode & Advanced Diagnostics?: You don't need to operate.“12V Repair”light is on, automatically start repair. Advanced Diagnostics: Over Voltage, Bad Battery, Over Temperature, Reverse Connection. Help you find problems quickly. ?Enjoy Precision Charging?: An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates. ?5-Grid Power Display?: 20%, 40%, 60%, 80%, 100%. What’s in the box : 1* On board battery chargers for boats; 1* 72'' Input cable; 3* 79'' Output cable; 3* Battery clips; 4* Screws; 1* Bag, 1* Manual.