Check the listing for details. 5V1A TP4056|18650 Lithium battery charging board Charger Module Micro USB Type-C. Condition: New. Listed at 0.99 USD. Instructions: 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 connecting the 5V voltage and charging it. If the battery is disconnected from B+ and B-, it also needs to be charged. Power off to activate the protection circuit. When using a mobile phone charger as input, note that the charger must be able to output 1A or more, otherwise it may not be able to charge normally The TYPE C USB socket and the + - pads next to it are the power input terminals, which are connected to 5V voltage. B+ is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT+ and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads. Connect the battery to B+ B-, insert the mobile phone charger into the USB socket, the red light is charging, and the blue light is full. Note: When charging, the load on the OUT terminal should be disconnected. The positive and negative poles should not be wrongly connected. Please use them according to the specifications, otherwise it will be damaged directly.