Description

DIY power bank/power bank circuit board Product Features:  1.4 LED lights display power, intelligent automatic shutdown in non-working state; 2. Built-in lithium battery protection IC, with over-current, over-voltage and under-voltage protection; 3. Dual USB output; 4. Motherboard size: thickness 8mm*width 32mm*length 69mm. Basic product parameters: Input port: MicroUSB (Android port) Input requirements: 5V constant voltage power supply can be used as charging input power, matching charger is above 5V1A Output port: USB Output parameters: 5V1A/5V2A Requirements for rechargeable batteries: Usable batteries: 18650 battery, mobile phone battery, tablet battery, MP3 battery, etc. 3.7V-4.2V polymer lithium battery, which can be powered by a single cell (slice) or multiple cells (slices) in parallel (series connection is not supported, and series connection is not allowed ). (Note: Parallel connection increases capacity, series connection increases voltage, so it can only be used in parallel!) You can connect 2-6 18650 batteries in parallel! ! ! Unusable batteries: dry batteries, accumulators, 1.2V rechargeable batteries, nickel-metal hydride batteries, 3.2V iron-lithium polymer lithium batteries, etc. Pay attention to the following points when installing the product: 1. The batteries must be connected in parallel, and the voltage must be between 3.2-4.2V to work. Both 18650 flat-head and polymer batteries can work; 2. The battery is positively connected to the motherboard B+ and negatively connected to B-, the motherboard will burn if installed; 3. The old and new batteries and batteries with different models cannot be mixed.