18650 Battery Insulator Ring

18650 Battery Insulator Rings are self-adhesive protection washers designed to sit around the positive terminal (top contact) of an 18650 lithium-ion battery cell. They act as an essential barrier between the positive pole and the outer negative casing, preventing accidental short circuits caused by worn outer wraps or tight battery compartments.

Features:

• Essential Short-Circuit Prevention: Isolates the positive terminal to ensure metal caps, re-wraps, or contact points don't create a direct short against the negative shoulder.
• Self-Adhesive Backing: Easy peel-and-stick application keeps the ring securely centered over the top cap during wrapping or pack assembly.
• Durable & Heat-Resistant: Typically made from non-conductive barley paper (fish paper) or high-temperature plastic (PET) that resists heat and mechanical wear.
• Ideal for Maintenance & DIY: Perfect for re-wrapping damaged 18650 cells, rebuilding power tool battery packs, or assembling custom power wall configurations.