For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
🔧 DIY500AMP.COM BUILDER COMPONENT
21700 2P 200A Copper Busbar Strip with Weldable Tabs
This 21700 2P Copper Busbar Strip is designed for builders creating high-current lithium battery packs using 21700 cells. It provides a cleaner and lower-resistance connection compared to standard nickel strip, making it a strong option for high-performance battery pack builds.
The copper busbar helps carry high current efficiently, while the weldable tab areas are designed for spot welding directly to the cell terminals when using the correct spot welding equipment.
📐 Important Cell Spacing Notice
This product has no extra cell-holder spacing. It is intended for close 21700 cell layouts where cells are placed without plastic holders, scaffolds, honeycomb frames, or extra spacers.
If your battery pack uses plastic 21700 holders or any type of cell spacer, please verify your spacing before purchasing. Some holders add extra distance between cells and may prevent the weld tabs from lining up correctly.
⚡ Available Variants
| Variant | Description |
| 21700 2P Direct | Straight aligned 2P layout for 21700 cells. |
| 21700 2P Dislocated / Staggered | Offset 2P layout for staggered 21700 battery pack designs. |
📏 21700 Dimension Reference
All measurements below are in millimeters. These are the 21700 dimensions shown in the product drawing.
| Measurement | Dimension |
| Strip Length | 800 mm |
| 21700 Cell Reference Diameter | Ø21.4 mm |
| Cell Pitch / Spacing Shown | 21.4 mm |
| Weld Tab Width | 8.2 mm |
| Weld Tab Height | 7.1 mm |
| Dislocated / Staggered Overall Height | 31.63 mm |
| Dislocated / Staggered Inner Spacing | 18.53 mm |
| Copper Thickness | 0.3 mm |
📊 Dimension Graphic
Original website graphic with the exact 21700 spacing numbers.
⚡ Key Features
- Designed for 21700 2P battery layouts: Available in Direct and Dislocated / Staggered versions.
- High-current busbar design: Rated up to 200A depending on the complete battery pack design, weld quality, cooling, cell selection, BMS, wiring, and connectors.
- 0.3 mm copper construction: Helps reduce resistance, voltage sag, and heat compared to standard nickel strip.
- Weldable tab areas: Designed for spot welding with the correct equipment and settings.
- Clean professional layout: Helps keep battery pack connections consistent and organized.
📦 What’s Included
- 1x 21700 2P Copper Busbar Strip in the selected variant
🔋 Common Applications
- High-power eBike battery packs
- Electric skateboard battery packs
- RC battery packs
- Power tool battery packs
- DIY lithium battery projects
- Custom high-current battery systems
🛠️ Installation Notes
- Test-fit the busbar before welding.
- Confirm the correct variant before purchase: Direct or Dislocated / Staggered.
- Verify spacing if using plastic holders, scaffolds, honeycomb frames, or spacers.
- Use fish paper rings on all positive cell terminals.
- Use proper insulation between cells and busbars.
- Confirm polarity before welding.
- Make sure your spot welder is capable of welding this type of busbar material.
- Do not exceed the safe current rating of your cells, BMS, wiring, connectors, or full battery design.
💡 DIY500AMP.COM Builder Note:
Copper busbars can help reduce resistance and heat in high-current battery packs. This is especially important for builders working with 100A+ systems, where voltage sag, heat, and connection quality become critical.
⚠️ Safety Warning:
Battery building can be dangerous if done incorrectly. Short circuits, poor welds, wrong polarity, or inadequate insulation can cause overheating, fire, or permanent cell damage. This product is intended for experienced battery builders.
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
Payment and Security
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Let customers speak for us
Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
VN in AZ
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