Voltage drop, low battery warning, end of battery life?

[dimizu]

Try running 1 battery down to below 5%, just hovering in the garden and after cooling down charge fully back up again until it stops charging then turn the battery on whilst still in the charger and see if it will charge a bit more before it stops charging.. This may reset the battery. Then try a near monitored flight and see how you get on. Just a suggestion before dumping any of your batteries.

Thanks