Description: The input terminal is equipped with MICRO USB master, which can be directly used to charge the lithium battery with the phone charger. And still retains the input voltage wiring solder, can be very convenient for DIY. Lithium battery charging board with overcharge, overdischarge and overcurrent protection. Input voltage: 5V Charging cut-off voltage: 4.2v 1% Maximum charging current: 1000 mA Battery over-discharge protection voltage: 2.5v Battery overcurrent protection current: 3A Board size: 26 X 17mm/ 1.02 x 0.67 inch Package Includes: 1 piece Lithium Battery Charger Board Note: When the battery is connected for the first time, there may be no voltage output between OUT+ and OUT-. At this time, the protection circuit can be activated by charging 5V voltage. If the battery is connected again after short opening from B+ B-, it also needs to be charged to activate the protection circuit. When using the mobile phone charger for input, please note that the charger must be able to output 1A or more, otherwise it may not be able to charge normally. MICRO USB busbar and the + - pad beside it are power input terminals, which are connected to 5V voltage. B+ is connected to the positive pole of the lithium battery, and B- is connected to the negative pole of the lithium battery. OUT+ and OUT- are connected to loads, such as moving the boost plate positive or negative or other loads. Connect the battery to B+ B-, plug the phone charger into the USB master, the red light is charging, the green light is full