4-level LED lights display power, intelligent automatic shutdown in non-working stateBuilt-in lithium battery protection IC, with over-current, over-voltage, and under-voltage protectionDual USB output;Motherboard size: thickness 8mm*width 32mm*length 69mm.Input port: Microusb (Android port)Input requirements: 5V constant voltage power supply can be used as charging input power supply, the most matching charger is 5V1A or moreOutput port: USBOutput parameters: 5V1A/5V2A

Requirements for rechargeable batteries:Available batteries: 18650 battery, tablet battery, mobile phone battery, MP3 battery and other 3.7V polymer lithium batteries, 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-argon 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 32-37V to work, 18650 flat-head and polymer batteries can work;2. The battery is positively connected to the motherboard B+ negatively connected to B-, and the motherboard will burn if it is installed3. New and old batteries, batteries with different models and brands cannot be mixed.