I just got back into it after 25 yrs of no fly., put my high wing trainer up like nothin, just like riding a bike, now back to flying my aerobatic bipe.
Charge your batteries turn everything on and see how long it takes before servos start jumping, lay a weight across the joysticks to false load the servos, repeat and discharge time should get better each time, if not you'll have to buy new bats.
I'm sure some some guys will find fault with these nethods but I remeber a time of having to scrape the bottom just for a jug of fuel so I had to be thrifty.