The 3x3 18650 Battery Holder is designed to securely hold nine 18650 lithium-ion cells in a compact 3-row by 3-column configuration. Made from high-quality, flame-retardant ABS plastic, it offers a snug 18.5 mm bore fit for each cell, ensuring stability, insulation, and safety during battery pack assembly. The holder allows efficient airflow for heat dissipation and prevents short circuits, making it ideal for building custom battery packs for e-bikes, power tools, and energy storage systems.