Germany · Battery knowledge hub
Recent Mercedes-Benz models typically use AGM main batteries, and some carry a small auxiliary battery that supports start-stop and electrical systems. Faults on either can show similar warnings, so diagnosis comes before replacement.
Select a model for generation-level battery notes
An auxiliary-battery fault can display warnings that look like main-battery problems. Testing both avoids replacing the wrong one.
Electrolyte is held in glass-fibre mats between the plates. AGM batteries tolerate frequent deep cycling and high electrical loads, which is why they are fitted to many premium and start-stop vehicles with brake-energy recovery.
Replacement rule: A vehicle designed for AGM should be fitted with AGM. A flooded or EFB battery in its place is likely to wear out quickly and may trigger charging-system faults.
Read the AGM guide →A strengthened version of the conventional flooded battery with improved cycling durability. EFB is commonly specified for entry-level start-stop systems that do not need the full capability of AGM.
Replacement rule: EFB can often replace a conventional battery, and AGM can often replace EFB — but EFB should not replace AGM. The vehicle may also need to be told which type is fitted.
Read the EFB guide →Generation-level information from our vehicle database. Where a field says “confirm”, it varies by engine or trim and is checked against your vehicle.
| Model | Generation | Years | Technology | Start-stop | Battery location |
|---|---|---|---|---|---|
| C-Class | W204 | 2007–2014 | AGM / Conventional | Some variants | Confirm |
| C-Class | W205 | 2014–2021 | AGM | Common | Confirm |
| C-Class | W206 | 2021–present | AGM | Common | Confirm |
| E-Class | W212 | 2009–2016 | AGM | Some variants | Confirm |
| E-Class | W213 | 2016–2023 | AGM | Common | Confirm |
| E-Class | W214 | 2023–present | Confirm | Confirm | Confirm |
| G-Class | W463 | 1990–2018 | Confirm | Rare | Confirm |
| G-Class | W463A | 2018–present | AGM | Confirm | Confirm |
| GLE | W166 | 2012–2019 | AGM | Common | Confirm |
| GLE | V167 | 2019–present | AGM | Common | Confirm |
Some models have a small secondary battery. "Auxiliary battery malfunction" messages refer to this, not the main battery.
Depending on the model, the main battery may be under the bonnet, in the boot or beneath the floor.
Start-stop Mercedes-Benz vehicles generally require AGM.
It refers to the secondary battery in some Mercedes-Benz models. The main battery may be fine. Both should be tested before deciding what to replace.
Most recent start-stop models do. We confirm from the existing battery label and the vehicle specification.
Tell us the model and year, and send a photo of the current battery if you can. We confirm the right battery before anyone sets off.
Daily, including late evenings. Out-of-hours requests are answered as technician availability allows.