The Battery Shield adds mobile power to the D1-Mini. The battery can be charged via a micro USB connection. The J1 jumper on the rear panel increases the charging current from 0.5 A to 1 A. • Charging voltage: 10 V max., 5 V recommended • Charging current: 500 mA/1 A • Lithium battery voltage: 3.3 - 4.2 V • Boost power supply :5 V (max 1 ) • Supplied with 2 pin headers 8-pin Pin assignment • 5 V: 5-V (max: 1-A) power supply • GND: GND Connections • XH-2.54MM (port 1): Connection to lithium battery (normal 3.3 - 4.2 V) • microUSB (port 2): charging port (normal 5 V) • Blue LED lights up when charging is complete • Red LED lights up during charging • J1 maximum charging current setting, 0.5 A or 1 A