There’s a simple solution for this, but be careful not to plug in an external battery if you already have an internal one connected, as this could cause excessive current flow. By bridging pins E and B, you can safely charge it externally with a 3S charger
Alright, someone might say, 'But what if I leave the battery connected all the time? Will it discharge?
1.07uA is nothing
All u need is a solder Iron and a 1cm cable (FUSE 2A).
As battery protection and balancing circuit I use something like that:
