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Fiat 500e secondary keyfob replacement case — image 1
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Fiat 500e secondary keyfob replacement case

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New case option for DYI battery replacement of Fiat 500e non-changeable battery keyfob

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Category
Automotive
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Notice: I had to put some tinfoil under the replaced battery to make the contact work

The pebble key (or "Steinschlüssel" in German) of the Fiat 500e has a non-replaceable battery. When after 2-3 years the battery runs out, Fiat wants you to buy a new one. Original price for the replacement was ~300€, but I read it's down to 80€ now. 

I used a knife and other general purpose tools to grind of the material covering the battery and designed a new case that puts quite some pressure on the battery/key fob. I still had to use a tiny bit of tinfoil to make a consistent contact, because I could not remove all residue from between the battery and the circuit board. 

The green plug is made from TPU, to prevent dust entering the case, the rest I printed in PLA. The hole is required to be able to push the key fob out in 2 years for the next battery. The lid/lid-holder has some chamfer to avoid support structures in the slits. Everything is designed with little tolerance, so you might have to tweak it a bit.

When inserting the key fob, pay attention to the orientation: on one side on the inside, there is a ramp to replace the removed part of the casing, and put the pressure on the battery contact. Before inserting the TPU plug, this side can easily be identified.

https://cad.onshape.com/documents/e63f791f02763c92d1f64be4/w/e9e2d14fa66f56543300f6b9/e/f45915e4a561a6a13a20f1fc

https://cad.onshape.com/documents/2e6342a833b8fe52ecdbefb0/w/c04007e8ac6b9b5c1b826f24/e/bf235666994f121af3d98ce2

https://cad.onshape.com/documents/9a16e044a749c2a5821d4f42/w/b8334b45aae370ee2ebfbbed/e/1042e8389d7694443ddcd316

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