Highland Barley Paper Insulation Roll for 18650 & 21700

Highland Barley Paper Insulation Roll for 18650 & 21700

4.9 / 5
Buyers should evaluate dielectric strength, adhesive tackiness, ease of cutting to size, heat resistance during battery spot welding, and roll width compatibility relative to their specific pack layout.
3.26 USD
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4.9 / 5
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Problem & Solution

Assembling or repairing custom 18650 and 21700 lithium battery packs poses inherent electrical risks. Exposed metal cell bodies, positive terminal rims, and nickel busbars sit close together. Without proper insulation, mechanical friction, vibrations, or misaligned nickel strips can wear down outer shrink wraps, causing short circuits or thermal runaway.

This 5-meter roll of highland barley paper with self-adhesive backing offers a continuous insulation barrier designed specifically for lithium battery pack builds. Users can cut precise lengths or custom shapes to wrap cell bodies, isolate parallel banks, or shield nickel connections, mitigating electrical shorts across the assembly.

Who Is It For?

Designed for DIY power bank builders, e-bike and scooter battery repair technicians, solar storage system assemblers, and electronics hobbyists who work with 18650 and 21700 cylindrical lithium-ion cells.

Key Features

  • Highland Barley Paper Material
    Delivers standard electrical insulation and abrasion resistance for cylindrical cell packs.
  • 5-Meter Continuous Roll
    Provides sufficient length for custom cutting across single or multi-cell pack configurations.
  • Self-Adhesive Backing
    Enables quick peel-and-stick application to battery casings without requiring external glues.
  • 18650 & 21700 Compatibility
    Versatile utility for standard lithium-ion cell dimensions used in custom power builds.

Technical Specifications

MaterialHighland Barley Paper (Fish Paper)
Adhesive TypeSelf-Adhesive Backing
Roll Length5 Meters
Compatible Cells18650, 21700 Lithium Battery Packs
Primary FunctionElectrical Insulation & Short-Circuit Prevention
Roll WidthNot specified in available data
Paper ThicknessNot specified in available data

Pros & Cons

Pros

  • Continuous 5-meter roll allows customized sizing for tailored pack layouts
  • Pre-applied sticky backing simplifies positioning during battery assembly
  • Designed specifically for common 18650 and 21700 battery form factors

Cons

  • Exact paper thickness and roll width are not specified in the product data
  • Requires manual cutting compared to pre-stamped terminal washer rings

FAQ

Is this insulation material pre-cut into rings or provided as a continuous roll?

It comes as a continuous 5-meter roll wrapped with adhesive backing, allowing you to cut custom lengths or shapes for your specific battery pack setup.

Can this barley paper be used for both 18650 and 21700 cells?

Yes, the product data confirms compatibility with both 18650 and 21700 lithium battery pack builds.

Does it require additional glue or thermal tape to stay in place?

No extra glue is necessary, as the paper comes manufactured with an adhesive backing for immediate stickiness.

What are the exact width and dielectric voltage specs for this roll?

The exact roll width and specific dielectric breakdown voltage ratings are not specified in the available product data.

Final Verdict

A reliable insulation material for hobbyists and technicians building or repairing 18650 and 21700 lithium-ion battery packs. The continuous roll format allows complete flexibility over patch sizing. Verify your preferred width and layout requirements before ordering.

Is It Worth Buying?

If you assemble custom lithium battery packs, electrical insulation between cells, nickel strips, and enclosure walls is mandatory. Highland barley paper (often called fish paper) is a standard dielectric barrier used to prevent accidental contact and shorts in custom 18650 or 21700 power systems.

Having a continuous 5-meter roll with adhesive backing gives you the flexibility to cut custom side wraps, sheet dividers, or custom terminal insulators. Unlike pre-punched rings, a roll format accommodates non-standard pack geometry, parallel group separation, and custom busbar routing.

Before finalizing your purchase, confirm whether your build requires pre-stamped terminal rings or custom-cut sheet insulation. If your workflow benefits from flexible, cut-to-size peel-and-stick paper, this roll fulfills essential battery assembly insulation requirements.

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