Automation Relay Module DC5V/2.1A Charge and Discharge Module Boost Module

Features:
Charge and discharge at the same times is allowed.
Works as a 4.2V/2.1A charge(on charge mode); works as a 3.7V to 5V boost module on discharge mode.
Over current protection; over voltage protection; short circuit protection; over temperature protection.
In discharge mode, charge mode keys function is invalid.
With batterysindicator.