No Cell, PCB Board Circuit Board For 12V 10.8V Li-ion Battery. No Battery Cell Included. Designed for battery pack repair and assembly. Intended for users with prior knowledge of battery performance and hands-on experience in battery assembly. Key Assembly Guidelines: - Use 18650 cells with matching model, voltage, and internal resistance for optimal consistency. - Common configurations: 10.8V (3S), 14.4V (4S), 18V (5S). - Voltage detection lines must be correctly connected to the corresponding terminals. - Use high-quality, new 18650 cells instead of salvaged or reused cells. - A spot welder is required for assembly. Protection Board Replacement Notes: - Before replacing the protection board, verify that all 18650 cell group voltages are balanced and consistent. - The protection board provides overcharge, over-discharge, and short-circuit protection only — it does not balance cell voltages. - Replacing the protection board will not resolve issues caused by voltage imbalance across cells. Important Notes: - PCB color varies based on available stock; no specific color can be guaranteed. - PCB layout and design may be updated while maintaining identical functionality and performance. - Component placement and quantity on the PCB may vary between batches without affecting operation. - Silkscreen markings may differ slightly across production batches but do not impact performance or usability. Color: Assorted (no color selection available) Material: PCB Package Includes: 1 x BAT411 Li-ion Battery Case Note: Actual product color may vary slightly due to lighting conditions and screen settings. Dimensional tolerance: ±1–3 cm.