battery empty after a while

[caxacix]

thank you so far..

And that is exactly the problem, battery is running low even if i have connected external power, also if i have the APU running and APU generator turned on, and the most strange thing, even if i have the both engines running and Gen1 and Gen2 turned on, the power is cutted off after a while...

I fear more and more that this is just a problem of the aircraft model or panel i've downloaded, but that would be a pitty because except that problem i find it very very great.