Oxygen problem and Engine start with Ground Power if battery run down

Oxygen, posted a bug thread.

While experimenting I noticed and thought it was well ... nice. Engine refused to turn over, lights seemed low but with connected Ground Power lights went up and engine started. Seem to remember this doesn't work in the Spitfire (I might be wrong).

Trip from Kobuleti to Vaziani was enough to recharge battery enough for engine start.

(Noted) Auto start sequence does not include connecting Ground Power (It does with I-16).