2-Cell 18650 Battery Holder – Positive & Negative Contacts

DescriptionSimple. Compact. Practical.

This compact, 3D-printable holder accommodates two 18650 lithium-ion cells side by side, using separate metal positive terminal plates and negative spring contacts.

The single-piece tray includes a central divider, retaining slots for the contacts, and two mounting holes in the base. It provides a practical way to integrate removable cells into an electronics project.

The contacts are left unwired. The electrical arrangement depends on how you connect them; the printed holder itself does not define a series or parallel connection. Wiring, charging, and battery protection electronics are supplied separately to suit your project.

Features

• Holds two 18650 cells side by side

• Designed for two positive terminal plates and two negative spring contacts

• Integrated slots to retain the metal contact plates

• Central divider between the cells

• Two mounting holes in the base

• Compact, single-piece body with rounded outer corners

• Open top for access to the cells

• Suitable for DIY electronics projects and prototypes

Included file

2 Cell 18650 Box.stl — the complete printed holder.

Overall dimensions: 76 × 43 × 20 mm.

The STL contains the plastic body. Batteries, metal contacts, wiring, and mounting hardware are separate components.

Materials needed

• 1 × printed holder

• 2 × compatible 18650 cells

• 2 × negative spring terminal contacts

• 2 × positive terminal contacts

• Wire and connectors appropriate for your project

• Optional mounting screws to suit the base holes and mounting surface

Use contacts matching the style shown in the photos. Contact plates can vary in width, thickness, and spring length.

Compatibility

Check the actual dimensions of your cells and contacts before printing, particularly when using protected or button-top cells, which may differ in length from the cells shown.

The contacts should seat securely in their slots, and the cells should fit without excessive force. Fit can vary with printer tolerances.

Suggested print settings

These are starting points rather than a tested print profile:

• Material: PLA suggested for a functional holder

• Layer height: 0.20 mm

• Walls: 3–4 perimeters

• Infill: 100%

• Orientation: Flat base on the build plate, open side facing up

• Supports: Check the slicer preview around the contact slots and end-wall holes

Keep the contact slots free of stringing and loose plastic.

Assembly

1. Print the body and clean up the contact slots.

2. Fit two negative spring contacts at one end and two positive contacts at the opposite end, as shown in the photos.

3. Complete any wiring with the cells removed.

4. If mounting the holder, fit the mounting screws before inserting the cells. Keep screw heads and wiring clear of the cells.

5. Check the connections for correct polarity and short circuits, then insert the cells in the correct orientation.

Use charging and protection electronics appropriate for the completed battery circuit.

About this design

I designed this holder to keep two 18650 cells together in a compact body while using separate metal battery contacts.

If you print one, I'd love to see how you use it in your project!

Designed by TD Circuits.

Happy printing!