18650 Charging Board Dual USB 5V 2.4A Mini-Type-C Lithium Battery Charging Module Portable Power Module with Overcharge, Overdischarge, Short Circuit Protection, LED Display Lithium Battery Charging Board with Overcharge, Overdischarge, Short Circuit Protection

This module is a portable backup power supply with a 5.0V adapter input to charge the internal battery. Using the built-in battery of a mobile device to provide USB2.0 5.0V/3.0A output for external devices.
LED digital screen displays the current charge level when charging. When discharging, the LED digital screen displays the current power, and the display is maintained for about 30 seconds (double-click the button to restart the display). The system will provide the most accurate mixture for the battery after full charging and discharging.
Charging cable: Supports three USB data cables charging, including iPhone and Android.
Note: The positive pole of the battery is connected to B+ and the negative pole is connected to B-, do not reverse it. It is recommended to use 3.7 to 4.2V polymer batteries or flat-top 18650 batteries, other battery types are not recommended (such as backup batteries or pointed 18650 batteries).