PVC Heat Shrink Tubing for RC Battery Packs — LiPO, NiMH, NiCd | 7mm–500mm | Black & Blue

Measure the circumference of your battery pack and divide by π (≈3.14) to get the diameter. Then select a flat-width tubing that is roughly 5–10% larger than that diameter so the sleeve slides on easily before shrinking. For example, a pack with a 30mm diameter generally fits well inside the 36mm (Φ22mm) flat-width option. When in doubt, size up — you can always apply more heat to tighten the fit, but you can't stretch tubing that's too small.

This PVC heat shrink tubing has a 2:1 shrink ratio, meaning it contracts to approximately half its original flat width when heat is applied. After shrinking, it conforms closely to the surface of the battery pack, providing a snug, wrinkle-free finish in most cases. The thickened wall variants may retain slightly more rigidity after shrinking compared to the standard wall.

PVC heat shrink typically activates at around 90–120°C (194–248°F). A standard heat gun on a low-to-medium setting is the recommended tool. Most consumer hair dryers do not reach sufficient temperatures to fully activate PVC shrink tubing and will generally produce an uneven or incomplete shrink. A dedicated heat gun is strongly recommended for consistent results.

Yes. PVC heat shrink is chemically inert once cured and does not react with the outer casing of LiPO, NiMH, or NiCd cells. It is widely used in the RC hobby community for re-wrapping and protecting battery packs across all common chemistries. Always allow the tubing to cool fully before handling the pack after shrinking.

PVC heat shrink provides a degree of moisture resistance and is generally suitable for light outdoor use — such as RC bashing in damp grass or light rain. However, it is not rated for full waterproof submersion. For applications requiring a watertight seal (such as RC boats or underwater electronics), adhesive-lined (dual-wall) heat shrink tubing would be a more appropriate choice.

The Thickened variants (available in select larger flat-width sizes) use a heavier wall construction, providing additional abrasion resistance and structural rigidity after shrinking. They are a good choice for large battery packs that experience frequent handling, vibration from rough terrain, or repeated insertion and removal from battery trays.

Absolutely. This PVC heat shrink tubing is also commonly used for wire bundling and cable management, protecting tool handles, sleeving cylindrical components in electronics builds, and general DIY insulation tasks. The wide size range — 7mm to 500mm flat width — makes it one of the more versatile heat shrink options available for workshop use.