Electronics

18650 to R20 Battery Adapter 3D Models

This collection gathers STL files for adapting 18650 cells to larger battery compartments, including R20, C, and 26650 sizes. You will also find holders, power tool pack adapters, and spot welding fixtures. It helps you find the right shape for a 3D printer before you commit to a print. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

A Polyzon collection · 48 models from 3 platforms

How this collection is put together

Polyzon assembles this collection from search results on the connected platforms. Repeats and models without a preview are removed, weak matches go to the end, and the rest keeps the search order. Models belong to their authors — check the terms on each model's page.

Selection rules: the Polyzon editorial team · Text updated 2026-10-14

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About the category

«18650 to R20 Battery Adapter 3D Models»

The models range from simple sleeves that center an 18650 in a wider slot to multi-part adapters that convert a cell into a C or D/R20 footprint. Some are one-piece spacers, while others include contacts, springs, or screw terminals. Power tool adapters often mimic a specific pack shape and may need a separate connector or wiring. Check the number of parts and whether the author shows an assembly diagram.

When choosing a model, look at the listed cell dimensions and the target compartment size, because R20, C, and 26650 are not interchangeable. Check whether supports are needed, the recommended material, and the wall thickness around the contacts. Photos of real prints can show how the adapter sits and whether the cell is held in place. If the model uses metal contacts, verify the author's notes on hardware.

To refine your search, try synonyms such as battery spacer, cell adapter, D-cell sleeve, or 18650 to D adapter. Related terms include battery holder, power tool battery adapter, and spot welding jig. You can also search by the device or pack name, like Parkside X20 or Ryobi, if you need a specific interface. Combining the cell size with the target size usually narrows the results quickly.

FAQ

Frequently asked questions

What is an 18650 to R20 adapter used for?
It lets a smaller 18650 cell fit into a compartment designed for a larger R20 (D-size) battery. The adapter usually centers the cell and may provide contact points.
Do I need supports for these adapters?
It depends on the model's overhangs and the orientation the author recommends. Check the model page for support notes and print orientation.
Can I use a 18650 adapter in a power tool battery pack?
Some models are made for specific pack shapes, such as Parkside X20 or Ryobi. You need to match the adapter to the pack's connector and terminal layout.
How do I find an adapter for a C or 26650 cell instead of R20?
Search for 18650 to C adapter or 18650 to 26650 adapter. The same collection often includes several target sizes.
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