Xiaomi mi Battery fault not charging .Plug charger to battery and switch ON. UNPLUG what looks like a balance lead PLUG. Refit plug and Battery will start charging. This has to be done with every charge cyle hence the the small hole for ease of access.Works every time for me..Good luck.ps since my first video my drone when 3mtrs high decided to flip upside down and crash.One motor was at fault but it smashed the 1080 camera to bits.This was all under 6 months old but Xiaomi would not honour there warranty after lots of emails to them so beware.With a new motor fitted and camera/gimble glued (not working) it fly's yet again.