I realize most everyone is going Lipo, but I have a large amout of Lithium ion packs avaliable to me. These are 4000mah 2c packs that drop right into a 18R. My question is would anyone be able to advise me on a charger for these packs ? A DC charger is fine as I allready have a power supply. I really don't want to spend a lot of money on this in case these batteries do not hold up to the vigors of RC racing. Thanks.