3pcs 3.7V To 5V 1A 2A Boost Module DIY Power Bank Mainboard Circuit Board Built In 18650 Lithium Bat

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.
Package included:

3 x?3.7V to 5V 2A boost module