No Cell, PCB Board Circuit Board for Bosch 12V 10.8V Li-ion Battery New, No Battery Cell Intended for repairing and assembling battery packs For individuals familiar with battery performance and experienced in battery assembly 1. Key considerations when assembling a tool battery pack: Use 18650 power cells with consistent model, voltage, and internal resistance. Higher consistency is recommended. - 10.8V: 3 cells in series - 14.4V: 4 cells in series - 18V: 5 cells in series Ensure the voltage detection wires are correctly connected. Use high-quality batteries; avoid recycled or salvaged cells. A spot welder is required. 2. Replacing the protection circuit board: Before replacement, 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 cell voltages, charging or discharging may fail. Replacing the protection board will not resolve voltage imbalance. Use new 18650 cells for best results. Please note: If you do not agree with the following, please do not purchase: (1) PCB color may vary based on available stock (2) PCB design may be updated while maintaining the same function and performance (3) The number and placement of components on the PCB may vary or be adjusted Color: Random color specific color requests cannot be accommodated Material: PCB Silkscreen markings may vary between batches but will not affect functionality Package Contents: 1 x BAT411 Li-ion Battery Case The package includes only the items listed above Note: Lighting effects and display settings may cause slight color variations between the product image and the actual item. Measurement tolerance: +/- 1-3 cm