Mercedes-Benz A-Class Battery: Specs, Fitment & Common Faults
A genuinely honest finding: unlike some other German brands, 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
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OEM Part Number: A0019828208
| Main battery, genuine reference (2013-2018, shared with B/CLA/GLA-Class) | Mercedes-Benz OEM: A0019828208 (also referenced as A0019828026) — AGM, Group H6/H8, 70-80Ah, 750-800 CCA |
|---|---|
| Auxiliary battery, genuine reference | Mercedes-Benz OEM: A2115410001 (also referenced as N000000004039) — small AGM, 12-14Ah |
| Battery cable/wiring harness, genuine reference | Mercedes-Benz OEM: A2465405933 |
Mercedes-Benz A-Class Battery: The Part Everyone Blames First, Not Always Correctly
On the Mercedes-Benz A-Class, more non-starts get pinned on the battery than on any other single component, and that assumption is correct often enough to justify checking it first. It's not always the real cause, though, so it's worth confirming before spending money on a replacement that doesn't fix the problem.
Mercedes-Benz A-Class Battery: What It Does
On the Mercedes-Benz A-Class, every engine start and every moment the electrical systems run without the engine turning draws on the 12V battery. Stop-start puts far more demand on that battery than older designs, given how often the engine cycles off and on — hence the need for an AGM or EFB battery instead of a standard type.
Mercedes-Benz A-Class Battery: Watch: Replacing It
Filmed on a W176. Many of these cars also have a small auxiliary battery.
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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz A-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 — connecting the terminals is often all that's needed. 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, or vice versa, since these two types have different charging characteristics that the car's computer needs to be told about. Worth confirming you're fitting a like-for-like replacement type before assuming coding is necessary.
It's also genuinely worth knowing that intermittent electrical glitches, such as random warning chimes, wipers activating unexpectedly, or indicator fault warnings, can be a sign of an ageing battery on a car of this age, worth having the battery properly load-tested before assuming a more complex electrical fault is developing.
Mercedes-Benz A-Class Battery: 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.