How to Replace the Battery in an Older Mercedes-Benz GL550 4MATIC Key?

2 Answers
SanAvery
07/25/25 3:48am
Steps to replace the battery in an older Mercedes-Benz GL550 4MATIC key: 1. Pull the key upwards while simultaneously releasing the clasp; 2. Use a flathead screwdriver to pry open the back cover of the key to reveal the battery; 3. Remove the old battery and replace it with a new one, paying attention to the polarity; 4. Reattach the back cover. The Mercedes-Benz GL550 is a full-size seven-seat SUV under the Mercedes-Benz GL-Class, weighing 2.5 tons. In terms of body dimensions, this vehicle measures 5146mm in length, 2141mm in width, and 1849mm in height, with a wheelbase of 3075mm.
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OPaislee
08/10/25 5:09pm
I remember changing the battery in my old Mercedes GL550 key fob several times when it died, and it was actually quite simple. First, you need to prepare a small tool, like a plastic card or a flathead screwdriver—avoid using anything too sharp to prevent scratching the key cover. Then, locate the small gap on the back of the key, usually near the Mercedes logo, and gently pry open the clips. Be careful not to use too much force, as the plastic can easily break. Once opened, you’ll see the coin-cell battery, typically a CR2032 model, which is available at supermarkets or auto shops for about ten yuan each. When removing the old battery, pay attention to the orientation (positive/negative sides) to avoid reversing it, and make sure the new battery is inserted the same way as the old one—usually with the positive side facing up. Finally, snap the cover back on and press it a few times to ensure it’s secure. After replacing the battery, don’t forget to test the lock/unlock functions. If it doesn’t work, take it to the dealership for a check. Key fob batteries usually last two to three years, but if it stops functioning, it’s better to visit a 4S shop to avoid causing issues by handling it yourself.
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