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Rechargeable key?

 
Old 03-23-2018, 08:45 AM
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Rechargeable key?

My car is having a hard time detecting my key and the car is brand new with 1100 miles, I gotta recharge this key?
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Old 03-23-2018, 08:57 AM
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The key can not be recharged. It uses an inexpensive button battery that should last for years.
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Old 03-23-2018, 09:18 AM
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How do you open the key to replace the battery?
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Old 03-23-2018, 09:57 AM
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W213 200CDI -Fascination
you look in the manual

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Old 03-23-2018, 10:04 AM
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Thanks, that helped since I donít have the manual next too me
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Old 03-23-2018, 10:44 AM
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The batteries don’t last for years because they are always sending a signal. My dealer replaces both batteries when I do my annual maintenance as part of the service.
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Old 03-23-2018, 12:18 PM
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On my previous car the original battery was replaced at 4 years with another replacement when the car was 9 years old. IMO a key fob transmits only when a button is pushed or it responds to a transponder signal. Otherwise battery replacement would occur more than once a year because those 3v batteries do not have very much power.

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Old 03-23-2018, 03:46 PM
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Originally Posted by nas2344 View Post
How do you open the key to replace the battery?
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Old 03-23-2018, 09:39 PM
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before changing your key fob battery, you might consider this
when you lock your car using key fob, if you press "lock" twice, the car will automatically set to "sleep" and won't receive any signal from key anymore. So if you come close to the car and grab door handle, it won't recognize it.
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