No Cell, PCB Board Circuit Board for Milwaukee 12V Li-ion Battery. No Battery Cell! Intended for repairing and assembling battery packs. For individuals familiar with battery performance and experienced in battery assembly. 1. What should be considered when assembling a tool battery pack? Use consistent 18650 power cells in model, voltage, and internal resistancebetter consistency ensures better performance. The voltage detection line must be properly connected. It is recommended to use new batteries rather than recycled cells. A spot welder is required. 2. When replacing the protection board: Before installation, measure the voltage of each 18650 cell group to ensure uniformity. The protection board provides safety functions only and does not balance voltage. If the battery pack has inconsistent voltages, charging or discharging will not work properly. Replacing the protection board alone will not resolve voltage imbalance. Use high-quality 18650 cells. Please note: If you do not agree with any of the following, please do not purchase: (1) PCB color may vary based on available stock. (2) PCB design may differ while maintaining the same function and performance. (3) The number and placement of components on the PCB may vary. Note: Due to different production batches, silk screen markings and appearance may vary. This does not affect functionality. Color: Random (color cannot be specified) Material: PCB Package Includes: 1 x Li-ion Battery Protection Board