1A 4.2V 3.7V 18650 LiPo Li-ion Lithium Battery Charger MPPT Solar
Function: 1. Lithium battery charger for solar powered systems.2. Supply voltage DC 4.4-6V, charging output voltage DC 4.2V.3. The maximum charging current/output current is 1A, but you can change the current by changing the value of the resistance R1.4.