How to Replace the Key Battery for Mercedes-Benz S-Class?

1 Answers
StMakayla
07/28/25 7:24pm
Press and hold the button on the back of the key, then slide the cover forward to open it and replace the old battery in the slot. When the car key battery is low, the following situations may occur: 1. Shortened remote control range: The remote only responds when very close to the car door. This could be due to low battery power, weakening the remote's signal transmission capability and reducing its range. 2. Occasional malfunction: It may take multiple presses to successfully unlock the door, which is a common sign of a nearly depleted battery. 3. Dim key indicator light: Observe the indicator light on the remote key. If it appears dimmer than usual or flickers when pressing the button, it's time to prepare for a battery replacement. 4. Dashboard display: Some models directly show the remaining battery level of the remote key on the dashboard. If a low battery warning appears, replace the battery promptly.
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