This is a 3.7V 18650 lithium battery charger module based on TP1056 with Micro USB interface.It is small size and light weight, especially for a single lithium battery charging. When battery is charging blue LED turn on and after charged the battery automatically turn off the charging (Red light will turn on when battery charged).
TP4056 Lithium-ion 18650 Battery Charger Module
Max Charging Output Current - 1 A
4.5 V ~ 5.5 V