Battery Spring Contacts: Sourcing Guide for Size C and 18650
Battery spring contacts and clips hold batteries in place and carry current. The right contact balances spring force, conductivity, and corrosion resistance so the connection stays reliable over the product's life.
Size C cells and 18650 cells use different contact styles, so the specification starts with the battery format.
Spring contacts for size C and D cells
Coil spring contacts fit the negative terminal of cylindrical cells like size C and D. The coil compresses to hold the battery and provide a stable contact point.
Key specs include wire diameter, coil diameter, free height, and the compressed force at the installed height.
Contact clips for 18650 cells
18650 cells are used in battery packs and devices where space is tight. Stamped or formed contact clips connect the cell terminals, often in series or parallel.
Phosphor bronze and plated spring steel are common because they combine conductivity with spring properties.
Material and plating matter for conductivity
| Material | Conductivity | Best use |
|---|---|---|
| Phosphor bronze | Good | High-cycle contacts, corrosion resistance |
| Plated spring steel | Good | Cost-sensitive, high force |
| Nickel-plated | Good | Corrosion resistance, solderability |
Plating protects the contact from oxidation and improves solderability. Nickel plating is common on battery contacts for both reasons.
What to specify
- Battery format (size C, D, AA, 18650, etc.).
- Contact type (coil spring, clip, or stamped contact).
- Material and plating.
- Installed height and required contact force.
- Connection method (solder, rivet, or press-fit).
Provide a sample or drawing of the battery holder if available. It removes ambiguity about mounting and orientation.
FAQ
What is the difference between a battery spring and a battery clip?
A spring contact compresses to hold the cell. A clip is a formed or stamped contact that grips or rests against the terminal. Both are used depending on the holder design.
Which material is best for a battery contact?
Phosphor bronze for high-cycle and corrosion resistance, or plated spring steel for higher force at lower cost. Confirm the recommendation for your application.
Can you make contacts for 18650 battery packs?
Yes. Stamped and formed contacts for 18650 cells are available. Provide the cell layout and connection requirements.
Do battery contacts need plating?
Plating improves conductivity and corrosion resistance. Nickel plating is common. Confirm the finish based on the environment and connection method.
Can I get a sample before a full order?
Yes. Samples can be made from your drawing or sample so you can test fit and contact force first.
What contact force do I need?
It depends on the battery weight and vibration environment. Share the application and the supplier can recommend a force range for a stable connection.
Specify the battery format and connection clearly
Battery contacts are straightforward to source when the battery format, contact type, material, and mounting are defined. A sample holder removes most of the guesswork.
Send your battery format, contact type, and a drawing or sample to get a quote for battery spring contacts.
Browse the Precision Springs catalog for related parts, or submit your specifications to request a quote.