These instructions apply to the SEAT Leon Mk4 (KL) 2020-present. For other models, please choose your vehicle here.
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Renewing a flat battery or disconnecting for other work on your SEAT Leon (KL, 2020–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 under a plastic cover. The petrol/diesel Leon has no high-voltage system; on the e-Hybrid (PHEV) the 12 V battery is still the owner-serviceable one — never touch the orange high-voltage cabling.
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, re-teach the one-touch windows, and store the tyre pressures again. Let the car sit a minute before driving.
Frequently Asked Questions
Where is the battery on a SEAT Leon?
In the engine bay under a plastic 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, one-touch windows and the TPMS baseline typically need re-doing.
Is the e-Hybrid safe to work on?
The 12 V battery is fine; never touch the orange high-voltage cables — that’s a workshop task.
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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