Mercedes-Benz Forum - View Single Post - Help!! with 2000 C 230 Smartkey replacement
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post #6 of Old 06-21-2009, 08:13 PM
Join Date: Jun 2009
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There is no charging taking place when the key is inserted into the ignition. The battery is not re-chargable either.

The reserve key, as a matter of fact, has no battery (see pic). It can only be used to start the car or open the door (with the mechanical key).

The battery in the key is only for remote functions.
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