Adapters & couplers

AA to D cell battery adapter

A hollow shell the size of a D cell that carries a single AA battery, letting you run a lantern, radio or toy on the smaller cells you already have. A D cell is 34.2 mm in diameter and 61.5 mm long; the shell uses those dimensions with a 14.8 mm bore for the AA, a bottom well that positions the negative end flush with the base, and an opening at the top so the AA's positive nub protrudes. A 3 mm side slit makes it easy to pop the AA out.

SpeakCAD builds the adapter to your exact cell type, including AAA to AA, 18650 to D or C-size shells, and gets the nub protrusion right so contact is reliable. Preview free in the browser and ask for a two-cell version or a thinner wall to save filament.

Get it nowGenerate and preview for free, in your browser. A download costs 2 credits.

Create an AA to D battery adapter. Outer cylinder 34 mm diameter, 60 mm long. Central bore 14.8 mm with an 8 mm top hole so the AA positive terminal protrudes 1 mm. 1 mm floor with a 6 mm hole for negative contact. 3 mm side slit, full length.

Change any number to match what you measured. The AI keeps the rest of the design consistent, and small follow-up edits after a download are free.

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Make your aa to d cell battery adapter now

Nothing to install and no CAD skills needed. Describe it, watch it render, download the STL or 3MF and print it tonight.

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