Volvo V40 Battery: Specs, Fitment & Common Faults
On the V40, related models with a shark fin roof antenna genuinely have their own small internal battery, with a fault there documented draining the main battery.
Illustration for editorial purposes
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Volvo V40 Battery: OEM Part Number
| Standard variants, case size | 278mm, 315mm, 317mm, or 353mm length, 175mm width, 190mm height depending on engine |
|---|---|
| Confirmed genuine spec, per owner's user guide (D2 diesel automatic) | 80Ah, 800A (EN), AGM Start/Stop Plus technology |
| Important | If a registration lookup suggests a lower capacity than your handbook states, trust the handbook — some retailers' databases default to a lower "compatible" spec rather than the genuine factory-fit capacity. |
Volvo V40 Battery: The Part Everyone Blames First, Not Always Correctly
On the Volvo V40, 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.
Volvo V40 Battery: What It Does
On the Volvo V40, 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.
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A Genuinely Useful Piece of Context Worth Knowing About Volvo's Electrical Architecture — Volvo V40 Battery
If your main battery keeps draining despite everything appearing switched off, this is genuinely worth knowing: on related Volvo models with a shark fin roof antenna, this housing has its own small, separate internal battery, and documented cases have found a fault specifically with this small battery causing the main car battery to drain. It's worth asking a dealer specifically whether this antenna module has been checked if you're chasing an unexplained drain.
It's also genuinely worth knowing a useful diagnostic principle: if a replacement battery experiences the exact same drain pattern as the original, this points toward a genuine electrical system fault rather than the battery itself being faulty.
Volvo V40 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 Volvo Battery
The same part, covered across other Volvo models.