Dual USB 3.7v to 5V 2A Mobile Power Bank Module

Overview:
The Dual Micro USB 3.7v to 5V 2A Mobile Power Bank Module can be used to build your own power bank.

Features:
4 states of LED lights to show electricity, non-working state smart automatic shutdown
Built-in lithium battery protection IC, over-current, over-voltage, under-voltage protection
Dual USB output
Size: 69 x 32 x 8mm

DIY 3.7v to 5V 2A power bank parameters:
Input port: Micro USB (Android port)
Input requirements: 5V constant voltage power supply can be used for charging input power, a normal charger of 5V 1A or higher will work
Output port: USB
Output parameters: 5V 1A / 5V 2A

Requirements for rechargeable batteries:
Battery - 3.7V-4.2V polymer lithium battery - 18650 battery, mobile phone battery, flat battery, can choose single cell power supply, or multiple cell parallel power supply(does not support the series).
Can be connected in parallel with 2-6 pcs 18650 batteries.
Suitable for Lithium-ion batteries only

Note for installation:
The battery should be connected in parallel, only the voltage between 3.2-4.2V can work
The battery must be connected to the board, B+ stands for the positive pole, B- stands for the negative pole, if it's connected in reverse, the board will burn
Don't mix old batteries and new batteries and batteries with different models and brands

What's in the box
1 x Dual Micro USB 3.7v to 5V 2A Mobile Power Bank Module