USB Charging Circuit for 3x 3.1V Lithium Batteries
- light indication (LED) while charging
- light indication (LED) for fully charged that stops the first LED
- protection against overcharge
There are a lot topics covering similar circuits but all of them are at least for 3.7V batteries which is dangerous for such a small battery (suggested charging voltage between 2.8V and 3.3V). Does anyone have any idea how to make such a circuit?