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Possibly of interest, but I made one of those ebay flip keys for two different cars.
It was a pretty straightforward process other than finding someone to cut the key for a reasonable price, which is difficult. I even bought the Chinesium key cutter machine from Alibaba or whatever. I was never able to make that work. I got several keys that would open the door just fine but wouldn't turn the ignition.
I second wpolls assertion that the chip itself requires no power. i know this because the chip comes in a little plastic bag separate from the key itself. after you program the chip to the EWS, you just stick it in the case of the flip key with adhesive.
I have never tried it, but it'd be easy enough to remove the chip and see if it will work outside the case, and test distance/proximity as well as how quickly the chip is read once the key is inserted and if there needs to be a 'sequential' event: chip is read, key inserted, or vice versa.
Interesting side note: These off-brand chips DO behave a touch differently. When I press the hatch-lid release, there's a 5 second delay before it opens. The door locks also have a slight delay, although not nearly that long. But it's certainly not a deal breaker for a cool flip key ; ) Also, the advanced functions such as rolling down all the windows...none of those work.
I like the idea of the $20 key-fob only though.
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2005 X5 3.0i - 71k mi (9.2018) -> 81k (9.19) -> 100k 9.21 -> 123k (8.25)
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SOLD : ( 2003 X5 3.0 - 177k mi (9.2018) -> 186k (9.19) -> 205k (9.21)
SOLD : ( 1997 328is Coupe - Hellrot Red
SOLD : ( 1988 528e w/ Bullseye s256 / MS2 Extra / GC Coilovers / Yukon Coils ~ 300+ HP
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