Note: The lithium battery protection board cannot be used with lithium iron phosphate batteries, xenon lamps, hand drill battery packs, electric fishing machine battery packs, electric bicycle battery packs, children's car batteries, motors with power outputs above 550 volts, or 1W fisheye LED lights. The power range described is suitable for the following products: Massager battery packs, LED light backup power supplies, 12V electronic products, solar street light battery packs, monitoring backup power supplies, and other products. Wiring Instructions: B+ connects to the positive terminal of the battery B- connects to the negative terminal of the battery MB connects to the connection point between battery 1 and battery 2 P+ connects to the positive terminal of the charge/discharge terminal (common for both charge and discharge terminals) P- connects to the negative terminal of the charge/discharge terminal (common for both charge and discharge terminals) Tips: When assembling a battery pack, that the battery voltage, capacity, and internal resistance are matched correctly. The battery voltage should be around the rated voltage of 3.7V. If there is no output after assembling the battery pack, charge it at 8.4V. Color: As Shown Material: PCB Package Contents: 10 * Boards 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.