12V 35 AV li-ion battery 432 Wh Compact and lightweight 12V35 AV lithium battery with digital charge status indicator. This battery operates at 12 volts, has a capacity of 35 Ah (ampere-hour), which means 432 Wh and weighs 3.1kg. This battery is used as a power supply for small electric motors and for depth gauges and fishfinders. The battery is completely maintenance-free and has as many as 1000 charge-cycles. That means 1,000 charges and discharges. It is significantly lighter than a comparable lead battery and has a much lower annual loss. Thanks to the built-in Battery Management System, you never have to worry about discharging the battery too deeply and damaging it.