Fiat 500 Battery: Specs, Fitment & Common Faults

Two entirely different battery systems live on this car — here's how to tell which one's actually causing your problem.

Generation covered: this guide is for the fully electric Fiat 500 (2020–present), with particular focus on 2020–2023 registered examples now old enough for parts to be a common search. This is an entirely different car from the previous petrol 500 (2007–2024), sharing no mechanical parts with it despite the similar styling — check your logbook or VIN if you're unsure which one you have.

Illustration for editorial purposes

Two Batteries, Two Very Different Jobs

As a fully electric car, the 500 has both a small 12V battery (for lights, infotainment and other electronics) and a much larger traction battery that actually powers the car. A fault with one doesn't mean the other is affected, but symptoms can sometimes look similar to an untrained eye.

Before you buy: confirm whether you need the 12V auxiliary battery or a service/repair on the main traction battery — these are entirely different parts with entirely different costs. Always confirm against your VIN before ordering.

Fiat 500 Battery: OEM Part Number

Accuracy note: this is the small 12V auxiliary battery, not the high-voltage drive battery pack. We weren't able to verify a confident FA1-specific (European) 12V battery part number at the time of writing — be aware that US-market Fiat 500e listings (Mopar-branded, e.g. part BBH3F001AA) use a different parts catalogue system and won't reliably cross-reference to UK/EU stock. Please confirm the correct part via a Fiat dealer or parts specialist using your VIN.

12V auxiliary battery, all trims	AGM technology, 242 x 175 x 190mm case (broadly equivalent to BCI Group 48/H6), typically 40-50Ah with around 400-500 CCA
Fitment note	Some parts catalogues cross-reference the 500e's 12V battery with the equivalent petrol 500's battery — if a listing doesn't show your specific 500e, checking the petrol model's part number is a genuinely useful workaround

If your 500e won't power on or struggles to enter drive-ready mode, it's this small 12V battery that's almost always the cause, not the large high-voltage drive battery pack, which is a separate, far more expensive component. Whether you're sourcing a replacement battery for your Fiat 500 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

Fiat 500 Battery: What They Do

The 12V battery powers electronics like lights, infotainment and the systems needed to "wake up" the car before the main traction battery takes over. The traction battery — either 24kWh or 42kWh depending on trim — is what actually drives the electric motor and determines range.

Fiat 500 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.