A fully charged remote key should be good up to 1.5 years stored in a drawer.

I swap remotes at daylight saving time change in the spring & fall...it makes it easy (for me) to know how long the one in the drawer has been sitting unused...plus it gets put back into service long before its battery completely discharges.

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)