DC 5V 2.1A 3 USB Power Bank Module Battery Charger Module Circuit Board Step Up Boost DIY Kit with Mobile Charging Data Cable

All 3.7V-4.2V rechargeable lithium batteries, such as cell phone batteries, flat batteries, 18650 batteries, and so on.

It could be connected to a lithium battery can also be connected in multiple sections of lithium batteries Lithium positive pole connected B + Lithium negative then B- 3 USB output, according to the device automatically recognizes the output 5V1A or 2A current on the phone.

Flat charge, you can also charge three mobile phones at the same time.

With a torch LED lamp (long press power button to turn ON or OFF).

Output voltage and current is stable, to protect USB devices during charging.

Module has protection from overcharge, overdischarge, short circuit and no need to worry about the time of charging.