18650 lithium battery bank charging module

Model: AA313.
Description:
This is a basic BMS system for building your own 18650 lithium-ion based power bank. It consists of the basic functions that you’ll need for a powerbank, such as auto shutdown when not in use, regulation during charging and discharging, power level indication, etc.

Features:
4-level LED indicator for showing energy level of the battery.
Auto shut-down when not in use.
Input charging power : 5 V.
Output power : 5 V 1 A / 5 V 2 A.
Micro USB input.
Dual USB output.
The type of rechargeable batteries can be used with this module are 18650, mobile phone battery, tablet battery, 3.7 – 4.2 V lithium ion battery. The battery must be only in parallel arrangement.
The type of batteries CANNOT be used with this module are dry cell, seal-lead acid batteries, 1.2 V rechargeable battery, Ni-MH battery, 3.2 V lithium ferrite battery.
The battery must be in between 3.2 – 4.2 V to operate normally.
Please connect positive terminal of battery to B+ pin and negative terminal of battery to B- pin. This module does not have reverse polarity protection, connecting the battery in reverse way will damage the module.
Avoid combining new and old batteries in a pack, it will cause irregular charging and discharging.
Dimensions : 69 x 32 x 8 mm.