Look what showed up today!
And before any of that lame “seeing how it feels and checking the build quality” crap, I started hacking on it.
Actually, very little hacking was needed to fit this 2s LiFe pack from my Futaba 4PV. Just needed to cut the leads off the AA holder and crimp on a male servo connector. Unlike old Spektrum radios, there is some good space in there for a battery pack, about 80mm x 50mm x 20mm from my measurements.
I’ll form thoughts on the radio later but at least now it has a battery that fits the whole “ultimate adventure radio” thing.