Dual Micro USB 3.7v to 5V 2A Mobile Power Bank DIY 18650 Lithium Battery Charger PCB Board Boost Step Up Module
Dual Micro USB 3.7v to 5V 2A Mobile Power Bank DIY 18650 Lithium Battery Charger PCB Board Boost Step Up Module 1. LED lights show the power, non-working state of intelligent automatic shutdown;Built-in lithium battery protection IC, over-current, overvoltage, undervoltage protection;Dual USB output.