18650 Barley Paper Insulating Rings – Reliable Anti-Short Circuit Protection
When building a battery pack, a single short circuit at the anode can ruin hours of hard work—or worse. These 18650 insulating rings provide the perfect solution: a slim 0.3 mm barrier between the anode and any surrounding conductive surfaces. Simple, fast, and highly effective.
Note: These insulating rings are designed exclusively for the anode (positive terminal) of 18650 cells and are not a substitute for structural battery pack insulation methods.
Why choose this set? (Key Benefits):
- Superior Anti-Short Circuit Protection — Electrically isolates the anode from the casing or adjacent cells, eliminating the risk of accidental contact in high-density packs.
- Durable & Flexible Barley Paper — Resists cracking during application and is impervious to water, oil, and abrasion, ensuring long-term stability for your battery pack.
- Dual-Colour Coding — Includes 50 green and 50 red rings, making it easy to differentiate groups or polarities when assembling powerbanks, 12V/24V/36V battery packs.
- Standardised 17.8 × 10.5 mm Dimensions — Perfectly compatible with 18650 cells from major brands like Samsung, LG, Panasonic, Sony, and Sanyo without the need for adjustments.
- Tool-Free Application — The flexible material conforms to the cylindrical surface and stays securely in place once the heat-shrink wrap is applied.
- 100-Piece Value Pack — Ideal for medium to large projects, from DIY powerbanks to battery packs for power tools or UPS systems.
Performance and Specifications
Barley paper is a trusted electro-insulating material in the battery industry, chosen specifically for its high dielectric strength and mechanical stability under varying temperature and humidity conditions. The 0.3 mm thickness provides robust protection without adding unnecessary bulk to the cell within its holder or wrap.
The material’s natural flexibility allows for manual application in seconds, with no risk of cracking or deformation. Its resistance to water, oil, and abrasion makes it suitable for both DIY hobbyist projects and industrial battery packs, including power tools, small electric vehicles, UPS systems, and off-grid solar installations.
| Parameter | Details |
|---|---|
| Cell Compatibility | 18650 Cylindrical Li-Ion Battery |
| Material | Barley Paper |
| Dimensions | 17.8 × 10.5 × 0.3 mm |
| Quantity | 100 pieces (50 Green + 50 Red) |
| Colours | Green (50) + Red (50) |
| Resistance | Water, oil, abrasion, ageing |
| Flexibility | High – manual application, no tools required |
| Primary Application | 18650 Anode insulation, anti-short circuit |
| Compatible Uses | DIY Powerbanks, 12V/24V/36V packs, power tools, UPS, off-grid solar |
Application Instructions
- Clean the anode surface of the 18650 battery — ensure it is dry, free of grease, and clear of oxidation.
- Select the desired colour for your coding scheme (green or red).
- Centre the ring over the anode, ensuring it fully covers the contact area.
- Press down gently — the flexible material will conform to the cell contour and remain in place.
- Proceed with applying your heat-shrink wrap or assembling the battery pack.
Package Contents
- 50 × 18650 Insulating Rings — Green
- 50 × 18650 Insulating Rings — Red
Frequently Asked Questions
Are these compatible with all 18650 cells, regardless of the brand?
Yes. The 17.8 × 10.5 mm dimensions adhere to the standard 18650 format and are compatible with Samsung, LG, Panasonic, Sony, Sanyo, and other major manufacturers.
What is the practical difference between the green and red rings?
There is no technical difference; performance is identical. The colours are provided for visual coding in complex packs, allowing you to mark different groups, charge levels, or polarities to reduce assembly errors.
Do the rings require adhesive to stay in place?
They do not require adhesive if you are applying a heat-shrink wrap, as the wrap will hold them securely. If you need them to stay in place before heat-shrinking, a small piece of electrical tape is sufficient.
Can these be used for 21700 or 26650 cells?
No, these are not suitable for larger cells. The dimensions are specifically calibrated for 18650 batteries. Larger cells have different diameters and anode surface areas, requiring format-specific insulating rings.
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