... the button once more to turn the unit back on. Battery Sizes Supported:1-4 batteries of: AAA, AA, N ... AAA,N,C,D,9V),Universal,Intelligent Alkaline Battery ChargerAvoid to damage the battery,don't charge unused (new brand ) ... reduce waste. You can even charge or regenerate mixed battery types and sizes at the same time!Get more ... throw away - saves money and helps reduce waste. Car Battery Charger RC999