Hi Sanal.

The problem here is not about turning the Master Battery Switch ON, but that the battery loses all power after a few minutes.

There was nothing worse than taking off and, after a short while, all of a sudden the Avionics would stop functioning. That is why myself and many others have added the electric_always_available=1 line into the aircraft.cfg. Adding that line means that the battery is always full (or at least something like that) and we don't lose our Avionics because of it.

Howell also stated that adding that line to the aircraft.cfg fixed his problem.

I'm hoping I have made this more clear for you. ;)

Mark