Yes there's a few, you need a power output of at least (4.2v x 4) x 5A = 84W. I've got the pro-peak constellation
http://www.sussex-model-centre.co.uk...xd.asp?id=4985 which has a max power of 120W, a max current 7A and will do up to 4S Lipo, but no built-in balancer mind.