I charged all 3 on the hub the first time and they are fine. I did however update the firmware on the batteries before putting them on the charger. It was also the previous firmware version back in May. No issues at all with the batteries.So, I got my new MA2 today and started charging the batteries. I put all three into the charging hub and the first one got a full charge before I saw a couple of YouTube vids saying the batteries should be charged separately the first time. I immediately took the batteries off the hub and plugged the second battery in separately. I hope this is no big deal.