An extreme example of the battery being the culprit:
A small airplane equipped with FADEC (Full Authority Digital Engine Control) was to be flown but it’s batteries were dead.
The flight manual warned against flying with low batteries but the two INSTRUCTOR RATED pilots started the aircraft with a start cart (effectively a jump start) anyway.
They took off and as is the procedure, brought up the landing gear on climb out.
There is a fairly big electrical load when that is done.
The FADEC system did not receive enough power to operate and went off line.
The plane made an off airport landing.
The “pilots” had much explaining to do.
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