2 Pack 18650 Battery Charger Protection Module MELIFE Power Bank PCB Module Board Dual USB 5V 1A 2.1A with BMS Protection DIY Mobile Charging Accessories Digital LCD Display Indicator

Note: 1. The B+ and B- connected to the boosted battery must not be reversed. Normally the flat surface of 18650 battery is negative pole while the other one is positive pole. 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 lamp. 3. 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 18650 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: You can also use lithium battery, mobile phone tablet battery) How to distinguish between battery + - pole and power box + - pole: Normally the flat surface of 18650 battery is negative pole while the other one is positive pole. Please install it correctly, or it may destory the battery. Why is there no power output after the battery is installed: After install the battery, you must plug in the 5V charger to activate it. Package Including 2 * Dual USB Charging Module