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Hmm.... a few things I would look at if I were you:
1. Since the smaller fob is made of metal it might be blocking the RF signal. But since you already tried switching back to the old fob and it still didn't work....
2. The battery might have shorted, if the + and - side of the battery touched the metal fob at the same time.
3. Same as with #2 one of the small capacitors on the chip might have shorted if there was no insulation between the chip and the fob.
I would recommend testing for a node using a multimeter making sure that no positive node is touching a negative one. Also it's really hard to tell from the pictures but I would add more insulation between the chip/battery and the fob (duct tape works).
Also insulation will protect the chip against Electrostatic Discharge which now that I think about it, it could be another reason why the keyfob is not working.
Hope this helps! Good luck!
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