Mercedes-Benz C-Class Battery: Specs, Fitment & Common Faults

On the C-Class, most Mercedes models genuinely don't require any coding for a simple, like-for-like battery swap — the only genuine coding needed is if you're switching battery types entirely.

Illustration for editorial purposes

OEM Part Number: A0019828208

Accuracy note: confirmed for the W205-generation C-Class (2014-2021) — some models with Start/Stop also use a separate, smaller auxiliary battery in addition to the main unit. Always confirm which one you need and check against your VIN, since earlier and later generations use different part numbers.

Main battery, 92Ah	Mercedes-Benz OEM: A0019828208
AGM auxiliary battery (some Start/Stop models)	Mercedes-Benz OEM: A0009829508 — a separate, smaller unit from the main starter battery, not a substitute for it
Note	Any battery replacement on this generation typically needs registering to the car's Battery Management System — skipping this can lead to incorrect charging behaviour and Start/Stop staying disabled.

The Part Everyone Blames First, Not Always Correctly

A car that won't start gets blamed on the battery more often than any other component, and it's right often enough to make that assumption a reasonable first check. But it's not always the actual cause, which is worth knowing before spending money on a replacement that doesn't fix anything.

Before you buy: battery size, capacity and type (standard vs AGM/EFB for stop-start systems) vary by trim and engine. Always confirm against your VIN before ordering.

Mercedes-Benz C-Class Battery reference plate

What It Does

The 12V battery provides the power needed to start the engine and runs electrical systems when the engine isn't turning. On cars with stop-start technology, the battery works much harder than on older designs, since the engine switches off and restarts far more frequently — which is exactly why these cars need a specific AGM or EFB battery type rather than a standard unit.

A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz C-Class Battery

This is genuinely worth knowing before assuming a battery swap requires specialist coding: unlike some other German manufacturers, most Mercedes models genuinely don't require any coding or registration for a simple, like-for-like battery replacement. The only genuine coding requirement worth knowing about is if you're switching battery types entirely, such as fitting an AGM battery in place of a standard flooded lead-acid unit, since these have different charging characteristics the car's computer needs to know about.

A genuinely useful finding worth knowing about what does need resetting: after a battery change, the one-touch function for the electric windows, and the sunroof if fitted, typically needs to be re-synced afterward, with the procedure detailed in the owner's handbook.

It's also genuinely worth knowing that intermittent electrical glitches, such as random warning chimes or unexpected wiper activation, can be a sign of an ageing battery on a car of a certain age, worth having it properly load-tested before assuming a more complex fault.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Battery Guide for warning signs to watch for, confirming fitment against your VIN, and matching the right technology (standard, EFB, AGM) when buying aftermarket.

More Mercedes-Benz Battery

The same part, covered across other Mercedes-Benz models.

Mercedes-Benz C-Class Battery: Specs, Fitment & Common Faults

OEM Part Number: A0019828208

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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz C-Class Battery