18650 & 21700 Battery Spot Welding Fixture – Precision Assembly Bracket

Take your DIY battery pack builds to the next level with this professional-grade spot welding fixture. Designed specifically for 18650 and 21700 lithium battery cells, this PLA plastic assembly bracket holds your batteries firmly in place during spot welding, ensuring consistent, accurate welds every time — no slipping, no misalignment.

Why You'll Love This Fixture

Professional Precision: Engineered to professional standards, this fixture keeps battery cells perfectly aligned so every weld is clean, consistent, and reliable.
Wide Compatibility: Fits both popular 18650 and 21700 cylindrical lithium battery cell formats — ideal for battery pack assembly, e-bike packs, power tool batteries, and more.
Safe Construction: Made from high-quality PLA plastic with no high-concern chemicals — safe for workshop and home DIY use.
Durable & Long-Lasting: PLA construction provides a sturdy, lightweight, and durable hold that stands up to repeated use in your projects.
Compact & Easy to Use: At just 16.2 × 7.7 × 3 cm, it's compact enough to fit into any workspace and simple enough for beginners and experienced builders alike.

Specifications

Material: PLA Plastic
Compatible Battery Types: 18650 / 21700 Lithium Cells
Dimensions: 16.2 × 7.7 × 3 cm
Package Contents: 1× Spot Welding Fixture (batteries not included)
Country of Origin: Made in China

Perfect For

DIY lithium battery pack assembly
E-bike, e-scooter & power tool battery builds
Home workshop spot welding projects
Hobbyists, makers, and electronics enthusiasts

Looking to round out your DIY toolkit? Check out these related products from our store:

For guidance on safe battery handling practices, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.

Note: Color may vary slightly from images due to monitor brightness and lighting conditions. Please allow minor measurement deviations of ±1–2 mm.

Frequently Asked Questions

Q: What battery sizes does this spot welding fixture support?

A: This fixture is designed to securely hold both 18650 and 21700 cylindrical lithium battery cells, making it versatile for a wide range of DIY battery pack projects including e-bikes, power tools, and custom battery builds.

Q: Is a spot welder included with this fixture?

A: No — this listing includes only the PLA plastic assembly bracket/fixture (1 piece). Batteries and spot welding equipment are sold separately. The fixture is designed to work with most standard spot welding setups.

Q: Is the PLA material safe to use in a welding environment?

A: Yes. The fixture is made from high-quality PLA plastic, which contains no high-concern chemicals. It is intended to hold batteries in place during spot welding rather than being directly exposed to welding heat, making it safe for standard workshop use.