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You MUST use each key occassionally or the battery will die!
If you have the ability, you can replace the internal battery. Worth a shot before buying a new key from the dealer. The battery is like $10. You NEED to use each key every so often so it continues to charge. My second key was absolutely mint and was likely not used for long periods, if ever. Here's the thread I used to repair mine. Once it was glued back together, I reprogrammed it and all is good. Way cheaper than buying a new key from the stealer.
replacing battery in key fob.... - E46Fanatics
By the way, these small Irwin clamps worked great to hold it while gluing it back together.
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2002 X5 4.4, Stahlgrau Metallic, 55k miles
Sport, Cold Weather, Rear Seat Heating, Rear Climate, Nav, PDC, Electric Rear Seat Back Adjustment, Rear Shades
Current Mods: M steering wheel, Mk4 Nav Retrofit, Intravee/Alpine/SpecDock, Cosmos Schwarz Interior Trim
Coming Soon: Hood Protector
Wish List: Aluminum Running Boards, Rear Backup Camera, 20" Staggered Style 87s (Black), Hitch Retrofit
1996 318ti, California package (plus tons of mods), Aqua Metallic, 237k miles
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