Battery choice is using so many coreless servos...the NiMh 4 cell weighs 5.9 oz, so that's okay. Ignition batt is 1100 mah NiCad, per ZDZ recommendations.
I **ALWAYS** prefer mah "on board" to "wish I'd recharged sooner" :-)
The Pitts I've flown in the past would tumble, snap, and spin like crazy!! TR no problem, given enough power, but the wing loading is likely too high for some of the more insane 3D stuff (not that I could do any of it anyway)