Reminds me of keith haring and mr doodle
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Maybe use some small round magnets that would keep contact to the cell +/- even if the printed spring allows movement or fails.
Interesting idea, I’ll have to see if it works 
Loving all these design ideas, esp having individual compartment so the board can flex… have anyone try TPU? is it too soft to protect the cells?
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I think TPU is a very real option. There is a wide range of flexibility out there - even beyond what the stated shore hardness would lead you to believe.
“Hard” TPU has replaced PETG for me when it comes to functional/structural parts. Especially if temperature resistance is a concern.
I have just found a flavor that is a mix of TPU and nylon (which by itself is typically beyond the capabilities of my machine). I plan to try an enclosure with it… but haven’t yet, so actual performance is still just speculation.
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Link? 
CC3D 72D Flexible TPU Filament Black 1.75mm 1KG 3D Printer Filament High Hardness High Toughness TPU Filament FDM Printer 3D Printing Material Comparable to Nylon Filament https://a.co/d/15DJMSA
It is VERY hygroscopic. I would consider drying absolutely necessary prior to printing. And it sure doesn’t help that the airtightness of the packaging was definitely lacking.
Note that this material hardness is spec’d in the shore D scale instead of shore A, as is more common. From memory I think that 72D is roughly equivalent to about 102A.
Edited for clarity
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Not as hard as the above material, but this also seems to be decent for structural applications of TPU. Have only printed about a kg of it myself.
RANKI TPU Filament 1.75 mm Flexible TPU, 3D Printer Filament, Dimensional Accuracy +/- 0.05 mm, 98A,1kg Spool,Black https://a.co/d/3JaOgKz
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@jack.luis has been the conductor on the Ranki TPU train for some time now. I need to order some of that stuff
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