NOCO Genius 4 Bank 2X4 Charger. Charges / maintains 6/12 volt lead acid and 12 volt lithium-ion batteries, 2 amp charging per bank. Start voltage sensor detects dead batteries as low as 1 volt. Force mode allows manual charging of extremely dead batteries (down to 0 volts). Built-in battery desulfation mode to recover worn-out batteries. Smart indicators quickly detect when the battery charger is connected in reverse polarity, connected to an incompatible battery, or if the battery is failing. Included per charging bank: Pair of detachable clamps, 10' extension leads.