PVC Heat Shrink Tubing for RC Battery Packs — 66mm Flat Width, 9 Colors

Flat width is measured when the tubing is pressed flat. A 66mm flat width corresponds to an expanded inner diameter of approximately 42mm (≈1.65"). This typically fits cylindrical RC battery packs in the 35–42mm outer diameter range. Always measure your pack's OD before ordering to ensure a proper fit.

PVC heat shrink tubing generally shrinks to roughly 50% of its expanded diameter when heated (approximately 2:1 shrink ratio). For this 66mm flat-width tubing, the recovered diameter is typically around 20–22mm. Apply heat evenly with a heat gun at a low-to-medium setting, moving continuously to avoid scorching.

PVC heat shrink tubing is generally suited for low-voltage insulation and provides adequate protection for typical RC battery pack voltages (2S–6S LiPo, NiMH packs). It is not designed for continuous high-temperature environments. For high-discharge racing packs that generate significant heat during use, confirm the tubing's temperature rating matches your application before committing to a full wrap.

PVC heat shrink tubing provides a moisture-resistant barrier that helps protect battery cells from light splashing and humidity during typical outdoor RC use. It is not a fully waterproof seal on its own. For submersible or heavy-rain RC applications, additional sealing measures are generally recommended alongside the tubing.

Measure the length of your battery pack and add at least 10–15mm on each end for overlap and a clean finish. For a single pack rebuild, 1m is typically more than sufficient. The 3m or 5m rolls are popular for hobbyists who build or rebuild multiple packs. The 20m and 50m rolls are suited for workshops, club group buys, or resellers.

Color is purely cosmetic and does not affect electrical or thermal performance. Many RC builders use color-coding to distinguish battery cell counts, charge levels, or ownership — for example, red for 4S packs and blue for 3S. The transparent option lets you inspect cell labels and capacity markings without removing the sleeve.

Yes. While this listing is optimized for RC battery pack wrapping, 66mm flat-width PVC heat shrink tubing is also commonly used for wrapping power tool battery packs, flashlight battery holders, cable bundling, and protective sleeving on cylindrical objects in the 35–42mm diameter range.