There are several places that sell ready made battery packs. Get rid of the individual cells. The batteries are OK, but the holder will cause you grief one day. Hangtimes.com, Radicalrc.com, Electrodynamics, E.h. Yost, RCaccessory.com to name a few. Then get a good charger. I have some(Turnigy brand) from HobbyKing USA that work well for about $20-40. I have also seen them with other brand name stickers on them on other websites. If you insist on using the holder, just get regular lead acid batteries and throw them out when they go low. You can buy a 32 pack that will last quite a while at most stores. Never have to charge that way. I have done it on my glider radios. One set of batteries will last better than two months of Sunday flying on a Hitec 3 channel transmitter.