400mm Large Diameter Heat Shrink Tubing for Battery Packs & Cable Insulation

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400mm Large Diameter Heat Shrink Tubing for Battery Packs & Cable Insulation

HomeDIYer

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Color: Black

Length: 1 Meter

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$33.96 USD

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400mm Large Diameter Heat Shrink Tubing — Reliable Insulation for Battery Packs & Large Cable Assemblies

When you're building or repairing large battery packs, cable harnesses, or industrial wiring assemblies, finding heat shrink tubing wide enough to do the job cleanly is a real challenge. Standard tubing falls short — literally. This 400mm large diameter heat shrink tubing is designed for makers, EV hobbyists, electricians, and DIYers who need a professional-grade sleeve that actually fits oversized components without improvising.

Each piece is supplied as a flat-width tube measuring 400mm (≈15.7") across when laid flat, available in lengths of 1 Meter (≈39.4"), 2 Meter (≈78.7"), and 3 Meter (≈118.1"). Made from polyolefin material, it offers consistent wall thickness, clean shrinkage, and reliable electrical insulation. Choose from Black, Blue, Transparent, or Fruit Green to suit your build or color-coding system.

Typical applications include wrapping 18650 lithium-ion battery pack assemblies, insulating large-gauge cable splices and bus bars, protecting copper tubing or conduit ends, and finishing custom power tool battery rebuilds — all scenarios where standard heat shrink tubing for battery wraps simply isn't wide enough.

ℹ️ Compatibility Note: This tubing is designed for components with a circumference of up to approximately 400mm flat-width. Verify your battery pack or cable bundle diameter before ordering. Shrink ratio is typically 2:1 — contact us to confirm for your application.

✅ Key Features of These 400mm Large Diameter Heat Shrink Tubes

🔋Battery Pack Ready — 400mm flat-width diameter is sized specifically for large-format lithium-ion battery pack wraps, 18650 cell groups, and custom power bank builds.
🔥Consistent Heat Activation — Polyolefin construction shrinks evenly with a heat gun, typically activating around 90°C (194°F), reducing the risk of scorching or uneven coverage on large surfaces.
🎨4 Color Options for Circuit Identification — Black, Blue, Transparent, and Fruit Green allow color-coded organization across multi-bank battery systems or complex cable harness assemblies.
✂️Cut-to-Length Flexibility — Supplied in 1M, 2M, and 3M lengths, the tubing cuts cleanly with scissors or a utility knife before application, minimizing waste on varied project sizes.
🛡️Electrical Insulation & Moisture Resistance — Once fully shrunk, the sleeve provides a snug insulating barrier suitable for protecting cable splices, bus bars, and terminal connections from incidental moisture and abrasion.
👁️Transparent Option for Visual Inspection — The clear variant lets you inspect solder joints, cell labels, or wire routing underneath the sleeve without removing it — useful for maintenance-friendly battery pack builds.

📐 Technical Specifications — 400mm Large Diameter Heat Shrink Tubing

Product Type	Large Diameter Heat Shrink Tubing
Flat Width (Supplied)	400mm (≈15.7")
Shrink Ratio	Typically 2:1 — contact us to confirm
Approximate Shrunk Diameter	See variant options / contact us to confirm
Available Lengths	1 Meter (≈39.4"), 2 Meter (≈78.7"), 3 Meter (≈118.1")
Available Colors	Black, Blue, Transparent, Fruit Green
Material	Polyolefin
Activation Temperature	Typically ~90°C (194°F)
Full Shrink Temperature	Typically 120–150°C (248–302°F)
Wall Thickness (Shrunk)	See variant options / contact us to confirm
Application Tool	Heat gun (recommended); avoid open flame
Typical Use	Battery pack wraps, cable insulation, bus bar protection, DIY electrical repairs

⚠️ Heads Up: Wall thickness and exact shrunk diameter vary by production batch. If your project has tight clearance tolerances, please contact us before ordering to confirm current specifications.

❓ Frequently Asked Questions

What length of heat shrink tubing do I need?

Measure the component or cable run you need to cover, then add at least 10–15% extra to account for shrinkage along the length axis. For battery packs, generally choose a length that extends 20–30mm beyond each terminal end. Available in 1 Meter (≈39.4"), 2 Meter (≈78.7"), and 3 Meter (≈118.1") options.

What is the shrink ratio of this tubing?

Large-diameter polyolefin heat shrink tubing of this type typically has a 2:1 shrink ratio, meaning it will shrink to approximately half its supplied diameter when heat is applied. The 400mm supplied flat-width will generally shrink down to around 200mm. Contact us to confirm the exact ratio for your specific order.

Can this tubing be used outdoors or in wet environments?

Standard polyolefin heat shrink tubing provides good moisture resistance once fully shrunk and sealed. For prolonged outdoor or submersion use, an adhesive-lined (dual-wall) variant is generally recommended. This product is suitable for indoor electrical insulation and short-term moisture protection in most DIY applications.

What temperature is needed to shrink this tubing?

Polyolefin heat shrink tubing of this type typically activates at around 90°C (194°F) and fully shrinks at approximately 120–150°C (248–302°F). A heat gun is the recommended tool. Avoid open flames, which can cause uneven shrinkage or scorching on large-diameter sleeves.

Is this tubing compatible with lithium-ion battery packs?

Yes. The 400mm flat-width diameter makes this tubing well-suited for wrapping large-format lithium-ion battery packs, 18650 cell groups, and similar assemblies. It provides electrical insulation and a clean, finished appearance. Always ensure the battery pack is fully assembled and cool before applying heat.

How do I choose the right color?

Color choice is generally functional or organizational. Black is the most common for electrical insulation and UV resistance. Transparent allows visual inspection of the component underneath without removing the sleeve. Blue and Fruit Green are useful for color-coding different circuits, voltage levels, or battery banks in multi-pack builds.

Can I cut this tubing to a shorter length before shrinking?

Yes. The tubing can be cut to any length with scissors or a utility knife before application. Cut cleanly and squarely to ensure even shrinkage at the ends. It is generally easier to cut before shrinking rather than after.

🛒 Select your color and length above, then add to cart — ships from our US warehouse.

400mm Large Diameter Heat Shrink Tubing for Battery Packs & Cable Insulation

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400mm Large Diameter Heat Shrink Tubing — Reliable Insulation for Battery Packs & Large Cable Assemblies

✅ Key Features of These 400mm Large Diameter Heat Shrink Tubes

📐 Technical Specifications — 400mm Large Diameter Heat Shrink Tubing

❓ Frequently Asked Questions

400mm Large Diameter Heat Shrink Tubing for Battery Packs & Cable Insulation

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