The 1x3 18650 Battery Spacer Holder is designed to securely hold three 18650 lithium-ion cells in a straight-line configuration. Made from durable, flame-retardant ABS plastic, it ensures a snug 18.5 mm bore fit for stable battery placement. The design provides insulation, prevents short circuits, and allows airflow for heat dissipation—perfect for DIY battery packs, e-bikes, and energy storage projects.