Mercedes-Benz GLS key fob battery
4 of the 10 model years listed for the Mercedes-Benz GLS have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2017Smart key
Not confirmed yet
- 2018Smart key
CR2025
Owner's manual: manualslib.com (checked Nov 1, 2026)
Manual text: “You require a CR 2025 3 V cell battery.”
Find CR2025 on Amazon - 2019Smart key
Not confirmed yet
- 2020Smart key
CR2032
Owner's manual: manualslib.com (checked Nov 1, 2026)
Manual text: “You require a CR 2032 3 V cell battery.”
Find CR2032 on Amazon - 2021-2022Smart key
Not confirmed yet
- 2023Smart key
CR2032
Owner's manual: manualslib.com (checked Nov 2, 2026)
Manual text: “You require a CR 2032 3 V cell battery.”
Find CR2032 on Amazon - 2024-2025Smart key
Not confirmed yet
- 2026Smart key
CR2032
Owner's manual: manua.ls (checked Nov 1, 2026)
Manual text: “You need a CR2032 lithium cell battery (3 V).”
Find CR2032 on Amazon
Changing the battery
Smart key (push-button start)
- Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
On the common chrome Mercedes key, a slide at the back frees the mechanical key, and pushing that key into the opening releases the battery tray.
A CR2025 is 20 mm across and 2.5 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.