MakerFocus 4pcs 186 50 Battery Charger Protection Module, Power Bank PCB Module Board, Dual USB 5V 1A 2.1A with BMS Protection for Phone DIY Mobile Power Bank

Note:1. The B+ and B- connected to the boosted battery must not be reversed.2. Long press the switch, the manboard will turn on the USB output,long press it again to turn off the USB output; Press the switch twice to turn on the lamp, and press twice again to turn off the lamp3. When use the board at first time, please connect 5V power adapter to the micro USB port to activate the board.It support multi battery in parallel connection.How to choose the right battery:The battery should be flat 186 50 battery, 65mm long, pointed battery can not be used. If you use old batteries, different capacities, different brands are not available, disassemble the battery to ensure that each voltage is at least 3.5V or more, if the voltage is too low, then you can put it into the battery.(Note: It also support lithium battery, mobile phone battery and tablet battery,.How to distinguish between battery +-pole and power box +-pole:In general, the 186 50 battery has a negative electrode in the plane, and a positive hole in t...