I've always cycled my keys to keep them charged, and so far, both my cars, 14 and 15 years old, still have both of their original keys in perfect working order!
Quote:
Originally Posted by pedro2u
when I purchased my E46, the 2nd key had been in the owners drawer for 9 years and was dead..... I put a battery charger on the car's battery and put the key in the ignition in the "on" position overnight. Worked like a charm after that recharge
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That's a nice stroke of luck!