# MERCEDES-BENZ Slk batteries

> The MERCEDES-BENZ Slk has run through 3 generations between 1996 and 2025, and we cover every one of them with 7 compatible batteries: 13 to 80 Ah, 200 to 800 A of cold cranking, from 59.10 € with VAT.

## MERCEDES-BENZ Slk generations

Batteries change from one generation to the next. When two share a year, the body style — or simply the plate — settles it.

| Generation | Years | Body | Batteries | URL |
|---|---|---|---|---|
| Slk III | 2011–2025 | berlina | 18 | /gb/car-batteries/mercedes-benz/slk-r172 |
| Slk II | 2004–2011 | berlina | 17 | /gb/car-batteries/mercedes-benz/slk-r171 |
| Slk I | 1996–2004 | berlina | 14 | /gb/car-batteries/mercedes-benz/slk-r170 |

## Best-selling batteries for the MERCEDES-BENZ Slk

| Modelo | V | Ah | CCA (EN) | Tech | € VAT incl. | Stock | URL |
|---|---|---|---|---|---|---|---|
| Car battery Varta E11 12V 74Ah 680A | 12 | 74 | 680 | PLOMO/ACIDO | 72,58 | ✓ | https://baterias.com/gb/battery-varta-e11-12v-74ah-680a |
| Car battery Varta E44 12V 77Ah 780A | 12 | 77 | 780 | PLOMO/ACIDO | 84,70 | ✓ | https://baterias.com/gb/battery-varta-e44-12v-77ah-780a |
| Start-Stop battery Varta A7 12V 70Ah 760A AGM | 12 | 70 | 760 | AGM | 118,15 | ✓ | https://baterias.com/gb/battery-varta-a7-agm-12v-70ah-760a |
| Car battery Varta D24 12V 60Ah 540A | 12 | 60 | 540 | PLOMO/ACIDO | 59,10 | ✓ | https://baterias.com/gb/battery-varta-d24-12v-60ah-540a |
| Start-Stop battery Varta A6 12V 80Ah 800A AGM | 12 | 80 | 800 | AGM | 146,65 | ✓ | https://baterias.com/gb/battery-varta-a6-agm-12v-80ah-800a |
| Car battery Varta D15 12V 63Ah 610A | 12 | 63 | 610 | PLOMO/ACIDO | 81,19 | — | https://baterias.com/gb/battery-varta-d15-12v-63ah-610a |
| Car battery Varta AUX14 12V 13Ah 200A | 12 | 13 | 200 | AGM | 69,54 | ✓ | https://baterias.com/gb/battery-varta-aux14-12v-13ah-200a |

## How to know which battery your MERCEDES-BENZ Slk takes

The real shortcut is your registration number. It settles generation, engine and factory battery in seconds — exactly where most people get it wrong when buying.

Prefer to do it manually? Check the date of first registration on your V5C and match it against the generation table above. When a year straddles two generations, the body style decides it: five-door hatch, estate or coupé.

As a final check, look at the battery currently fitted: the label shows capacity (Ah) and cold cranking amps (A). Always replace with equal or higher figures, never lower, and keep the same dimensions and terminal layout.

## Start-Stop: which battery your Slk needs

The later Slk generations run Start-Stop, which puts the battery through hundreds of micro-cycles a day. These cars require EFB (basic Start-Stop) or AGM (Start-Stop with regenerative braking): fitting a conventional battery instead cuts service life to a few months and the ECU may disable the function. Rule of thumb: never downgrade from the technology fitted at the factory.

## Frequently asked questions

### Which battery does a MERCEDES-BENZ Slk take?
It depends on the generation and engine: there are 7 compatible batteries in total, from 13 to 80 Ah and 200 to 800 A of cold cranking. The best sellers for this model are Car battery Varta E11 12V 74Ah 680A, Car battery Varta E44 12V 77Ah 780A, Start-Stop battery Varta A7 12V 70Ah 760A AGM. With your plate we tell you the exact one in seconds.

### How much does a MERCEDES-BENZ Slk battery cost?
Between 59.10 € and 146.65 €, VAT included, depending on capacity and technology (lead-acid, AGM). Start-Stop versions (AGM or EFB) sit at the top of the range because they withstand many more cycles.

### How do I know which generation my Slk is?
By the registration year: Slk III (2011-2025); Slk II (2004-2011); Slk I (1996-2004). If your year falls in the overlap between two generations, tell them apart by body type (hatchback, estate or coupé) or use the plate finder, which settles it with no doubt.

### Can I fit a battery with more amps?
Yes, as long as the dimensions fit the tray and the terminal layout matches. More capacity (Ah) and more cold cranking (A) do not harm the vehicle: the alternator charges it the same and you gain margin in winter. What you must never do is go below the original figures.

### How long does a MERCEDES-BENZ Slk battery last?
Between 4 and 6 years in normal use. Start-Stop batteries (AGM/EFB) tend to last slightly less in city driving because of the number of starts, but they are designed for that cycling. If the car sits unused for weeks or you notice slow cranking in the cold, get it checked.

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Updated: 2026-08-26 · https://baterias.com/gb/car-batteries/mercedes-benz/slk