After sitting on the shelf for over two years I decided to revive my P4P. The batteries have been in lipo bags the whole time (I did check on them periodically). I plan to fly all five batteries later today or tomorrow and was thinking in the interest of time I would only fly them down to around 60%. But, now I'm wondering if it would be better for battery health to fly them down to say 10% then fully charge them again before further flights?