Power Bank Dual USB 5V 2A 18650 Li-ion Charger with LED indicator. T

All Batteries to parallel connection, input voltage is  3.2-4.2V and it gives output 5v, 18650 and polymer battery can be used.

Connect the battery + and - to the motherboard B+ B-.

Use same battery type, do not mix new and old or different current rating.

Features:

4-level LED lamp display power, not working state intelligent automatic shutdown;

The built-in lithium battery protection IC, over-current, overpressure, under-voltage protection;

Dual USB output ports.