Dual USB Power Bank Module (Charger) DIY Self-made Powerbank 18650 [ElectricA]

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✍ Battery parallel requirements between 3.2-4.2V can work properly.

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▼ Features
LED lights show the power, non-working state of intelligent automatic shutdown;
Built-in lithium battery protection IC, over-current, overvoltage, under-voltage protection;
Dual USB output.
 
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▼ Specifications
Input port: MicroUSB (Andrews mouth)
Input requirements: 5V constant voltage power supply can be done to charge the input power supply,
the most matching charger for 5V1A above
Output port: USB
Output parameters: 5V1A / 5V2A
Power Input from battery: 3.7V ~ 4.2V DC