15-Cell 21700 Battery Housing: Precision-engineered plastic case designed specifically for assembling or repairing 20V lithium battery packs with 15 x 21700 cells and integrated protection board. Replacement-Focused Design: Directly replaces damaged, worn, or nonfunctional battery covers and PCB housings-perfect for experienced technicians and DIY battery rebuilders. Stable Integrity: plastic construction maintains secure cell alignment and consistent contact pressure during operation and charging cycles. Compatible With DCB609-Style Packs: Matches dimensions and mounting features of common 20V power tool battery platforms-verify fit using YOUR SPECIFIC MEASUREMENTS before assembly. Professional Repair Component: Intended solely for users with hands-on knowledge of lithium battery safety, voltage balancing, and integration-NOT a consumer-ready battery unit.