Montevador - check your PC (if its a laptop!!) to see what the output is. I use my to charge 3S lipos up to 2200 with no problems. I never charge 'in-car' cos I like my 2 cars the way they are now, not smouldering wrecks[] Or see your LHS and get advice ona buying a transformer to o the same job. Ask the experts always.....good luck flying.