If you own 1S LiHV (LiPo) batteries with BT2.0 connectors, you might be interested in this charger by BetaFPV.
Learn about BT2.0 connectors here.
Where to Buy?
Specs and Features
It’s plug and play for BT2.0 batteries.
Charges up to six 1S batteries individually at the same time.
It takes 3S or 4S LiPo as power supply, they also sell wall adapter if you want to power it with AC.
It shows you the input voltage in real time.
LED indicators for charging status (red means charging, green means finished)