[lincpimp]

Or, you could use a pair of cell phone batteries, as they have an lvc built in. You would still need a voltage regulator to get it down to the correct voltage. Sike knows more about this than I, but I have been using nokia cells (3s) in my 2pl and 3pm for a while. They are only 1000mah, but are super light, and I have a few packs made up so that I can swap them out. i have also seen some of the voltage regulators that have active lvcs built in. They are designed for lipo receiver packs in nitro vehicles, but should work as well in a radio.

I also just made a lipo pack for my M8 radio. Used 3 2500mah 18c cells that I had laying around, as they fit the strange battery tray perfectly. That radio has a 9.1v buzzer built in. It is not an active lvc, but hopefully I do not leave it on... Do you think that 18c is a bit much for a radio battery...