21700 Battery Insulators

21700 battery insulators are adhesive terminal rings that protect against shorts when you're building a pack.

Right at the positive end of a bare cell, the wrap edge sits close to the metal casing — and that's a prime spot for a short if the wrap gets nicked or pinched during assembly. An insulator ring covers that junction, keeping the positive terminal cleanly isolated from the casing so your build stays safe through welding and handling. Small part, real consequence.

Made to fit 21700 cells, these are a go-to supply for anyone welding cells into series or parallel packs.

Key features

• Adhesive rings sized for 21700 cells
• Isolate the positive terminal from the casing
• Reduce short-circuit risk during assembly
• A staple of safe pack building

Built for

• Custom and DIY 21700 pack assembly
• Protecting terminals during spot welding
• Preventing wrap-edge shorts
• Series and parallel pack builds