Tired of AA's...

[J57ltr]

I kind of did the same thing for my MX3 Cell batts are a great idea. I used batteries I got from Snellemin. They are perfect for 3 to fit in the TX case with the tray removed. there is actually a lot of wiggle room even with the balance connector and foam I added to the back. My radio shuts off at 9V and I think these batteries can actually go down to 2.8V They charge as Li-po and are about 1800mah.
Not a very good pic but.