As said above, Rx off, Tx off, bring my plane to the pits, defuel, then keep starting/running engine until it won't start anymore, followed by after run oil (even though fuel says not to use it). I charge my plane over night (that night) with the wall wart that came with my radio. I also charge the night before I fly, again over night with the wall wart. They charge so slow it won't hurt the batteries. I have a nice Venom AC/DC charger that I use for cycling, charging at the field, topping off in a pinch, etc. I have a voltwatch on my plane monitoring Rx battery, and use the screen on my Tx to monitor that battery. If I think there might be a problem, I charge battery with Venom, then discharge at C/5, then recharge and see if the battery took a full charge.