18650 Dual Micro USB 3.7V to 5V 2A Boost Mobile Power Bank DIY 18650 Lithium Battery Charger PCB Board Step Up Module With Led

Features:

1. 4 level LED lights show electricity, non-working state smart automatic shutdown;

2. Built-in lithium battery protection IC, overcurrent, overvoltage, undervoltage protection;

3. Dual USB output;

4. Motherboard size: 69 x 32 x 8mm(L x W x H)

Product basic parameters:

 Input port: Micro USB (Android port)

Input requirements: 5V constant voltage power supply can be used for charging input power, the most matching charger is 5V 1A or more

Output port: USB

Output parameters: 5V 1A / 5V 2A

Requirements for rechargeable batteries:

 Available battery(3.7V-4.2V polymer lithium battery):

18650 battery, mobile phone battery, flat battery, MP3 battery, can choose single cell power supply, or multiple cell parallel power supply(does not support the series). (Note: increasing capacity in parallel and increasing voltage in series, can only be used in parallel!)

 Can be connected in parallel with 2-6 pcs 18650 batteries!!!

 Batteries are not available:

Dry cells, batteries, 1.2V rechargeable batteries, nickel hydrogen batteries, 3.2V iron lithium polymers, lithium batteries, etc.

Product installation should pay attention to the following points:

1. The battery should be connected in parallel, only the voltage between 3.2-4.2V can work, 18650 flat head and polymer batteries are available;

2. The battery is connected to the motherboard, B+ stands for the positive pole, B- stands for the negative pole, if it's connected reversely will burn the motherboard;

3. The old batteries and new batteries, the batteries which model and brands are inconsistent, these battery can not be mixed.