I just purchased one of these
http://www.hobbycity.com/hobbycity/s...er_Lipoly_Pack
on the advice of several of my friends at the club after I noticed my TX voltage dropping much faster than normal. If you already have the Lipo chargers and such then it is easy to use. I just used it for the first time last weekend, and It worked great. The others guys who turned me on to them say they only have to charge thier radios once a month or so. Make sure and set a low voltage alarm on your transmitter if you have one to keep from discharging too low. If you dont have a computer radio just check the voltage regularly and dont discharge too far.