Battery shield 18650 3.7v/TWO BATTERES to 5v with charger protection

• Intelligent input and output without worrying about long charging time.
• Support 3V / 1A and 5V / 2.2A two voltage output!
• Please charge and activate the board before use, otherwise it will not work properly
• Alarm protection when the battery is lower than 3V, and completely shut down without action when the battery is lower than 2.4V
• Special attention: the positive and negative poles must be determined for installation, and the positive and negative poles are clearly marked on the board! Wrong installation will burn the module!