18650 Battery Insulation Paper Hollow Ring 0.25mm (1 pc, Dark Green)
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Prices updated: 14 Oct 2026
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About this product
A single hollow insulating paper ring, 0.25 mm thick, for 18650 and 18500 lithium cells. It is placed at the cell ends in a battery pack to prevent short circuits between adjacent cells or metal holder parts. The 17 mm outer and 10 mm inner diameters suit the cell end.
Specifications
- Compatibility
- 18650 / 18500 lithium cells
- Outer diameter
- 17 mm
- Inner diameter
- 10 mm
- Thickness
- 0.25 mm
- Quantity in package
- 1 piece
- Color
- Dark green
Frequently asked questions
Is it suitable for 18650 and 18500 cells?
The listing states compatibility with 18650 and 18500 lithium cells. Check that the ring diameters fit your cell end and holder before assembling the pack.
Why is insulation needed between cells?
Adjacent cell ends and metal holders can touch and create a short circuit, which can overheat or damage cells. An insulating ring placed at the cell end helps prevent this. It does not replace proper spacing, holders and nickel-strip wiring.
