Safety in battery applications. The insulating ring on the battery is, next to the heat shrink tubing, the most important part of the insulation. This protects the battery from unwanted short circuits on the front side (positive pole) where the danger of a short circuit is highest due to the proximity of the poles.

Insulating rings (insulating washers) for repairing damaged batteries.

Examples of use: Re-shrinking of rechargeable batteries.
The insulating rings are temperature resistant up to 150 °C and self-adhesive on one side, so they re easy to apply when reshrinking without much effort.

Size: Outer diameter: 17 mm; Inner diameter 7 mm; Thickness 0.3 mm.

Scope of delivery: 1 piece includes 8 insulating washers.
With a purchase of 5 pieces, 40 insulating rings are supplied.

We also have heat-shrinkable tubing in various colours to match the insulating rings. Cut to fit 70 mm for 18650 cells. Item number: 400511

Tips and safety:

Replace damaged protective sheath and insulating ring. Attach additional heat shrink tubing and additional insulating washer to extend safety (especially important for industrial cells). Replace if insulating rings or shrink sleeves are already worn or damaged.

Many battery suppliers for everyday use such as Efest, Keeppower, Enerpower ect. already provide their own batteries with durable PVC shrink sleeves to ensure safety in use. As industrial batteries are built for further processing, the protective coating of the cells is not sufficient for daily applications. A damaged protective sheath can quickly become the undoing of a Li-Ion battery. (short circuit, fire, explosion etc.).