4x 3.7V 1000mAh Lipo Battery 952540 for Arduino Nodemcu ESP32 Development Board

Charging Method: The recommended charging current is 0.5A, the maximum is not more than 1A. The discharge current is recommended 0.5A, and the maximum is not more than 1A Overcharge Protection: When charging the battery, when the voltage reaches the highest battery voltage (4.2V), the protection board will automatically power off and shut down, indicating that it will not continue to charge when fully charged, form an overcharge protection Over-discharge Protection: When the battery is about to run out and the voltage is as low as 3.0V, the protection board will also be turned off and can no longer be discharged, forming an over-discharge protection effect.