MPPT Li-ion battery charger
This MPPT Li-ion battery charger chargers your Li-ion battery with 1A, using a solar panel that outputs 4.4-6V. It is ideal when you want to use a Li-ion battery as a power source when you go camping or hiking and there is no power to charge your battery with, to power your light.
If needed, the MPPT Li-ion battery charger power source can also be changed to a normal 5V power source and it will still charge the Li-ion battery under the correct conditions.
Technical specifications:
| Input voltage | 4.4V - 6V |
| Output voltage | 4.2V |
| Max output current | 1A (adjustable when R1 is replaced) |
| Battery type | Li-ion |
Below is a schematic that should be used to set the MPPT Li-ion battery charger up:
Also have a look at:
Li-ion battery charger protector