The input has a MICRO USB female connector, which can be directly input as a mobile phone charger to recharge the lithium battery, and the input voltage wiring pad is also reserved, which can be very convenient for DIY Charging cut-off voltage: 4.2V ± 1%; Maximum charge current: 1000mA Input voltage: 5V; Battery over-discharge protection voltage: 2.5V; Batteryovercurrent protection current: 3A; Connect the battery to the B + B-, inserted into the USB female mobilephone charger, the red light is being charged, the green light to full The charge should disconnect the load OUT terminal on the positive and negative can not be wrong, please according to specifications, otherwise it will damage directly MakerFocus Plates for batteries