The K99 Mini Automatic Spot Welder DIY Kit is a 12V DC pulse welding tool designed for joining nickel strips onto Li-ion and Li-Po battery cells. When the welding probes touch the nickel strip on the cell, the auto-trigger fires a high-current pulse through the copper trace PCB circuit, fusing the strip to the battery terminal. The spot welder kit delivers consistent weld quality without manual timer calibration — the auto-trigger controls pulse duration automatically on each contact.
The battery spot welder kit is the most practical tool for anyone building custom battery packs at home or in a lab. Soldering Li-ion cells directly is dangerous because soldering iron heat transfers into the cell and can cause internal damage or venting. The k99 mini automatic spot welder avoids this entirely by using a very short high-current pulse that bonds the nickel strip in milliseconds without raising cell temperature significantly. One trade-off: the K99 is designed for thin nickel strips — 0.1mm to 0.15mm thickness works best. Thicker strips may require multiple weld passes.
The diy spot welder kit is used widely by electronics engineers and hobbyists for repair of battery packs in power banks, e-bikes, UPS systems, and RC car battery assemblies. The K99 Mini Spot Welder for battery pack work delivers clean welds on 18650, 21700, and pouch cell formats. Available from StemVolt, this unit is suitable for engineers working on battery applications and practical electronics projects.
Related Product:
- Explore The Lithium-Ion Batteries collection for battery pack assembly
Features:
- Auto-trigger pulse fires immediately on probe contact with nickel strip surface
- PCB copper trace design carries high weld current with minimal resistance loss
- Welds standard 0.1mm to 0.15mm nickel strips onto 18650 and Li-Po cells
- 12V DC input works from car batteries, bench supplies and 12V adapters directly
- Compact PCB form factor fits small workbench and portable battery repair setups
Technical Specifications:
Applications:
- 18650 battery pack assembly uses K99 Mini Automatic Spot Welder DIY Kit for tab welding
- Power bank repair of battery packs uses diy spot welder kit for nickel strip replacement
- Battery repair uses k99 mini automatic spot welder for Li-ion cell connection
- RC car battery pack uses diy battery spot welder kit for custom Li-Po pack assembly
- Electronics lab uses K99 Mini Spot Welder for battery prototype pack construction
Package Includes:
- 1 × K99 Mini Automatic Spot Welder DIY Kit
Sunil Kumar –
Highly recommended welding kit
Meena Verma –
Automatic pulse welding for consistent joints works smoothly during battery tab welding
Arjun Nair –
Received bubble wrap packing with express delivery, product quality feels durable and automatic pulse welding gives stable and consistent welding performance.
Akash Patel –
Value for money product
Rajesh Mehta –
Useful for College project with proper support for Li-ion and Li-Po battery pack assembly
Lavi Singh –
Used this kit for Li-ion battery pack assembly during school project work, welding response was accurate and COD available option made ordering convenient.
Pankaj Yadav –
Bought from a verified seller in Rajasthan, after sale support was helpful and the K99 Mini Automatic Spot Welder worked perfectly.