These instructions apply to the Fiat 500 (312) 2007-present. For other models, please choose your vehicle here.
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Renewing a flat battery or disconnecting for other work on your Fiat 500 (312, 2007–present)? The 12 V battery is in the engine bay. Do it in the right order and the car relearns its settings cleanly.
Where the Battery Is
Open the bonnet — the 12 V battery sits in the engine compartment, usually under a cover. The petrol and mild-hybrid 500 have no high-voltage traction system (the separate 500e is an EV and not covered here).
Disconnecting
- Switch everything off, remove the key and wait a couple of minutes.
- Lift the cover and slacken the negative (−, black) terminal first; lift it clear.
- Release the positive (+, red) clamp only if you’re removing the battery.
Reconnecting
- Fit positive first, then negative, and tighten both firmly.
- Switch the ignition on, wait, then start.
Afterwards
Re-set the clock/radio and reset the tyre-pressure monitor. Let the car sit a minute before driving so the systems re-initialise.
Frequently Asked Questions
Where is the battery on a Fiat 500?
In the engine bay under a cover — a standard 12 V battery.
Which terminal comes off first?
Negative (−) off first; positive (+) on first when reconnecting.
What resets when I disconnect it?
Clock, radio presets and the tyre-pressure baseline typically need re-doing.
Do I need to code a new battery?
For a like-for-like replacement, no coding is needed for normal running.
This is a common job. If a warning light stays on afterwards, check the code on autodtcs.com.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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