They are smart batteries, you can charge them to 100%, they'll auto discharge to 60% in a few days.
You want to check every now and then if they are still at 60% (you can tell by the LEDs that turn on) and cycle them every 6 months or so (fly or...
I just recently took my drone out of storage. I discharged my batteries before I did so. I have since been told that this was the wrong thing to do and that what I should have done is maintain a 50% charge in them during storage.
However, I can...
If you get them out and they charge. DON'T just go out an fly. Start it and let it hover 3-4 feet off the ground and see how long the battery holds before power levels drop. Fly it back and forth 10-20 feet repeatedly to put drain on it. But do...
TOO LATE. But I did it. I didn't screw up too badly. I scuffed the plastic face / flange of the motor. But nothing structural. :) Yup it was crap-ton of rust on the spindle. Once I cut the hooks off, I just held the motor body in place and...