The charge should disconnect the load OUT terminal on the positive and negative can not be wrong, please according to specifications, otherwise it damage directly. Module Features and parameters:Inputs with MICRO USB/TYPE-C USB female, can be directly input to do with the phone charger rechargeable lithium battery,And still retains the input voltage wiring pads, can be very convenient DIY Input voltage: 5V;Charging cut-off voltage: 4.2V ± 1%;Maximum charge current: 1000mA;Battery over-discharge protection voltage: 2.5V;Battery overcurrent protection current: 3A;Board size: 2.6 * 1.7CM Note: The first time you access the battery, it may no voltage between the output OUT + and OUT-, then access 5V voltage charge your can activate the protection circuit, and the battery from the B + B-, then draw a line on the short open also need recharged to activate the protection circuit. Note that the charger must be to output 1A or more to do when using a mobile phone charger input, or may not charge Color: Blue Material: Plastic+Metal Specification: Micro Package Contents: 20 Pcs Charger Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.