yeah i saw a vid where he pulled the back off and soldered something to something and pluged in a lipo and it was all good
then i saw another vid where some guy used a rihno 3 cell and said all u gotta do is cut the plug off the AA battery pack and solder it to ur lipo (but it was only this 1 special "Riho" brand battery)
well im a cheep ass so i grabbed one of my old lipo (2650 3cell i got from xheli), and cut the plug off the AA pack and soldered it onto an adaptor (so i can unplug that to charge it)
now i dunno wat it would do if i didnt have the back light in the TX (it may get hot or blow up hell it may even poop gold i dunno)
but yeah im a cheep ass and it works for me (and if it fails then its only like $60 for a new one)