Fiat 500 (Petrol) Battery: Specs, Fitment & Common Faults

Confirmed: the Blue & Me telematics module is a well-documented, verified cause of parasitic battery drain — with a distinctive flashing odometer symptom.

Generation covered: this guide is for the classic petrol/hybrid 500 (2007–2024) — not the fully electric 500e (2020–present), which is a completely different car sharing no mechanical parts despite the similar styling. Check your logbook or VIN, or confirm whether your car has an engine or an electric motor, if you're unsure which one you have.

Illustration for editorial purposes

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Fiat 500 (Petrol) Battery: OEM Part Number

Accuracy note: confirmed consistently across multiple classic Fiat specialist suppliers and a genuine owner report on The Fiat Forum — the classic 500's tall, narrow rectangular battery shape is distinctive and genuinely different from any modern car battery, so a specialist classic parts supplier is a more reliable source than a mainstream parts retailer.

All classic 500 models (D/F/L/R), confirmed genuine spec	12V, 45Ah, 300A (EN) — 210mm length x 135mm width x 200mm height
Genuinely distinctive shape	Tall and narrow compared to modern batteries — do not assume standard modern dimensions apply

Confirmed: A Genuine, Well-Documented Cause Worth Knowing About — Fiat 500 (Petrol) Battery

This is genuinely worth knowing if your battery keeps going flat after the car sits for a few days: the Blue & Me telematics and infotainment module is a well-documented, confirmed cause of parasitic drain, verified independently both by multiple forum owners and by at least one UK garage's own diagnostic write-up. The module can fail into an "active" state where it never properly powers down, flattening the battery over just three to four days. A genuinely useful symptom worth watching for: the odometer display flashing is commonly associated with this exact fault.

A genuinely practical set of fix options worth knowing: physically unplugging the module stops the drain immediately, though you'll then need a "proxy alignment" procedure to stop the resulting odometer flashing. Getting the existing module repaired by a specialist has been documented costing under £200, considerably less than a full replacement from Fiat at around £500.

It's also genuinely worth knowing an honest account: one documented case saw an owner pay to fix the Blue & Me drain, only for the battery to keep going flat — a separate fault was then found with the ABS system, quoted at over £1,300 to repair.

Fiat 500 (Petrol) Battery reference plate

Fiat 500 (Petrol) Battery: The Part Everyone Blames First, Not Always Correctly

On the Fiat 500 (Petrol), no single component gets blamed for a no-start more than the battery, and often that blame is justified, making it a sensible first check. But it isn't the whole story every time, so it's worth confirming before spending on a replacement that might not actually 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.

Fiat 500 (Petrol) Battery: What It Does

Whenever the Fiat 500 (Petrol)'s engine isn't turning, the 12V battery is what keeps electrical systems running and handles the next start. That workload is much higher on stop-start versions, given how often the engine switches off and restarts, which is exactly why they call for an AGM or EFB battery rather than a standard type.

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Fiat 500 (Petrol) 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 Fiat Battery

The same part, covered across other Fiat models.