Volvo XC40 Battery: Specs, Fitment & Common Faults
On the XC40, 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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OEM Part Number: 30644962
| Genuine reference (720CCA, most markets) | Volvo OEM: 30644962 |
|---|---|
| Higher-capacity option (760CCA, some markets/variant codes) | A genuinely different specification — confirm your exact variant code and chassis number range before ordering |
| Important | Any battery replacement generally needs the factory-required diagnostic procedures performed for correct charging behaviour. |
Volvo XC40 Battery: The Part Everyone Blames First, Not Always Correctly
When a Volvo XC40 won't start, the battery is the first suspect more often than anything else, and it's right often enough that checking it first is a reasonable move. It isn't always the actual cause though, which is worth knowing before paying for a replacement that solves nothing.
Volvo XC40 Battery: What It Does
Starting the engine and running electrical systems whenever the engine isn't turning — that's the Volvo XC40's 12V battery job. If it has stop-start, it works much harder than older designs, since the engine cuts out and restarts constantly, which is exactly why it needs a specific AGM or EFB battery rather than a standard one.
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A Genuinely Useful Piece of Context Worth Knowing About Volvo's Electrical Architecture — Volvo XC40 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 XC40 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.