Thought I would save a buck and bought some extra batteries from Powerextra for my MavicPro. Two new batteries for $115. I used them once but didn't get the flying time I thought I should have so I put them on charge again. They never seem to get full bars on the indicator though. I put them away where they laid dormant for a month. I decided to do a little flying bt the dang batteries are so dead, the level indicator won't come up and they won't accept a charge. Litiums should last longer than a month unused. I have boy video cameras and use nothing but lithiums and the only time I have that problem is if the cells are dead. These guys are too new for that. It's possible I've gotten a bad batch. I've sent in a complaint to the company but me thinks when it comes to vital parts like batteries, it's best to stick with originals from DJI, either direct or via Amazon or other certified DJI dealer. We'll see how this plays out but buyers beware of batteries from Powerextra. If they make restitution and either send me replacements that work or full refund, I'll report back.