Home › Key fob batteries › Mercedes-Benz
Mercedes-Benz key fob battery
The chrome-edged Mercedes SmartKey uses a CR2025; newer keys from about 2014 on often use a CR2032.
| Battery | Used in | Size | Capacity |
|---|---|---|---|
| CR2025 | Mercedes-Benz (most common) | 20 mm × 2.5 mm | ≈ 165 mAh |
| CR2032 | Mercedes-Benz (also used) | 20 mm × 3.2 mm | ≈ 225 mAh |
Mercedes-Benz: starting with a dead fob
Put the key in the marked holder in the centre console; on many older cars, pull off the start button cap and insert the key into the ignition lock.
Not sure which you have? See CR2032 vs CR2025: same look, different size.
To change it: release and pull out the metal key, twist its tip in the seam to split the case, and fit the new cell the same way up. Step-by-step guide.
Also mainly CR2025: Mazda.
Key types change between model years; the code on your old battery is final.