Following your advise I found this one, price is great:
http://www.amazon.com/Guest-2611A-Battery-Charger-24-Volt/dp/B000NHZV1S/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1392233966&sr=1-1&keywords=Guest+1+bank+Marine+Battery+Charger
I need 1 bank charger and this one has 2 set of cables, what do I need to do with another set, which I am not going to use? if I leave it unplugged what will happen once I will put battery on charge?