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Old 10-06-2012, 07:51 PM   #2
Shonky
Registered User
 
Join Date: Dec 2010
Location: Brisbane, Australia
Posts: 289
My Ride: 2004 E46 M3
Physically unlocking and starting the car have nothing to do with the battery or the remote section of the key.

Doesn't matter which order you resync to my knowledge and even if it did, just re-sync in the opposite order. You can't hurt your other key.

The batteries do die, but I would expect it to be a slow death rather than an instant one.
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