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How to Replace the Battery in a Mercedes-Benz E400 Hybrid Key?

1 Answers

VonNatalie

07/29/25 6:09pm

Steps to replace the key battery for Mercedes-Benz E400: 1. Locate the small switch at the upper-middle section on the back of the key, gently press it to remove the mechanical key. 2. Press the key back cover release button on the rear side to detach the cover. 3. The battery is housed in the battery compartment on the left side of the key. 4. Remove the old battery. 5. Insert the new battery with the '+' side facing upward. 6. Reassemble the key cover and mechanical key. 7. Test the key's lock/unlock functions to confirm proper operation. Precautions for battery replacement: 1. Improper battery replacement may damage the car key. 2. Replacement batteries must be of identical specifications. Only use new batteries with the same rated voltage, size, and specifications. 3. To prevent premature key failure, avoid pressing the unlock button outside the sensing area. 4. Exposure to magnetic fields within 1 meter may cause battery magnetization failure. 5. Always perform the operation with dry hands, as moisture may lead to battery corrosion.

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