There are so many of these out there. The AAA batteries in others could get clogged. This should be fixed here. I modified this so that you could attach them side my side to form a block and allow for more storage. Mix and match as many as you need and connect with the wedges. You can scale the wedge uniformly  to get a perfect fit.
2024/07/03 update:
Added new versions that you can cut to size using the slicer's “Cut” function. They are a little over 240mm. Should give you plenty of storage space.
Print Settings
Printer Brand:
Prusa
Printer:Â
I3 MK3S
Rafts:
No
Supports:Â
No
Resolution:
0.3
Infill:Â
25%
Filament:
Hatchbox PLA White
Category: Organization
Extendable Battery Holder
by cgenco · original on Printables ↗
Hobby & Makers / Organizers
♥ 290⬇ 2.2k🖨 46 prints
Print profiles
Battery_Holder_v3_wedge.stl
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Prints on: A1 mini 0.4PLA
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Battery_Holder_v3_AAA.stlDEFAULT
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Battery_Holder_v3_AA.stl
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AA7_tall_merged.stl
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AAA7_tall_merged.stl
⏱ time and weight estimated after preparation · 1 material(s)
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Prints on: A1 mini 0.4PLA
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