2P nickel strip – stable connections for serious 18650 battery packs
Have you ever built a battery pack only to find out a few months later that the strips have oxidized or that the temperature is rising suspiciously during discharge? Often, the strip material makes all the difference. This nickel-coated steel strip (99.96% layer) provides solid conductivity, corrosion protection, and an excellent balance of cost and performance for DIY projects and practical applications.
Note: The strip is made of steel coated with 99.96% nickel. Being steel, it is attracted to a magnet; the nickel layer provides protection and superior conductivity compared to uncoated steel.
Why choose this model? (Key advantages):
- 99.96% nickel-coated steel — the nickel coating reduces contact resistance, improves weld quality, and protects against corrosion compared to bare steel strips
- Good oxidation resistance — the nickel layer limits steel exposure and maintains stable connections over time, even in moderately humid environments
- 20.2 mm 2P spacing — aligns perfectly with standard and 3D-printed holders for 18650 cells without any adjustments needed
- Clean welds at 60-70 J — adheres firmly to Li-Ion terminals with flat, well-anchored spots suitable for everyday vibrations and loads
- 5-metre roll — plenty of material for a 13S4P e-bike pack or several smaller DIY projects
- Multiple applications — suitable for off-grid solar systems, UPS units, power tools, and high-capacity power banks
Details and Performance
Unlike uncoated steel strips, which corrode quickly and have higher contact resistance, 99.96% nickel-coated steel delivers a uniform conductive surface and reliable corrosion protection. The 0.15 mm thickness remains consistent across the entire width of the strip, while the 27 mm wide 2P format simultaneously covers two poles of aligned parallel 18650 cells, cutting down on the number of welding operations compared to narrow strips. The result: faster assembly, fewer contact points, and a compact pack.
| Parameter | Value / Detail |
|---|---|
| Material | 99.96% nickel-coated steel |
| Thickness | 0.15 mm |
| Width | 27 mm |
| Roll length | 5 metres |
| Configuration | 2P – 20.2 mm cell spacing |
| Cell compatibility | Li-Ion 18650 (and other formats with compatible spacing) |
| Assembly method | Spot welding |
| Recommended welding energy | Minimum 60-70 J |
| Corrosion resistance | Good – thanks to the nickel plating |
| Main applications | DIY batteries, power tools, solar systems, UPS, e-bikes |
Instructions for Use
- Measure and cut the strip to the required length depending on the number of cells in your 2P setup.
- Align the strip across the terminals of the 18650 cells, making sure the edges of the strip match the centre of the terminals.
- Temporarily secure the strip to prevent movement during welding.
- Perform the spot weld using a machine set to at least 60-70 J — adjust your settings to achieve proper penetration without burning through the terminals.
- Visually inspect every spot weld — correct welds should be smooth, flat, and securely anchored to the terminal.
- Test electrical continuity with a multimeter before sealing up the pack.
Package Contents
- 1 x Roll of 2P nickel-coated steel strip – 5 metres long, 27 mm wide, 0.15 mm thick
Frequently Asked Questions
What is the real difference between pure nickel and nickel-plated steel?
Pure nickel offers better conductivity and does not expose a steel core over time. Nickel-plated steel is more budget-friendly, providing a conductive surface and corrosion protection thanks to the nickel layer, though its overall conductivity is lower than pure nickel, and heavy wear can eventually expose the steel underneath.
How can I quickly check if the strip is nickel-coated steel?
Two simple clues: the strip is attracted to magnets (due to the steel core). During an HCl acid test, the nickel layer resists initially; if it’s scratched or thinned out, the underlying steel may react, indicating the presence of a steel core.
What spot welder works with this strip?
Any battery spot welding machine rated for at least 60-70 J. Adjust the time and power according to your machine’s specifications to achieve flat, well-anchored welds without piercing the terminals.
Can I use this strip for cells other than 18650?
Yes. It also works for 21700 cells or other cylindrical formats, as long as the 27 mm width and 20.2 mm spacing fit your layout. For non-standard setups, the strip can be cut and adapted manually.
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