These instructions apply to the Peugeot 308 Mk3 (P5) 2021-Present. For other models, please choose your vehicle here.
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Taking the 12 V battery off a Peugeot 308 Mk3 (P5, 2021–present) is a simple under-bonnet task. Here’s the safe order, plus what to re-teach once power is restored.
Battery Location
The 12 V battery lives in the engine bay under a cover. Petrol (PureTech) and diesel (BlueHDi) 308s are conventional — no high-voltage system. The plug-in hybrid 308 also keeps a 12 V battery here, but leave its orange high-voltage components to a specialist.
Disconnecting
- Turn the ignition off, take the key clear and wait a minute.
- Undo the negative (−) terminal first and move the lead aside.
- To remove the battery, undo the positive (+) and the clamp.
Reconnecting
- Connect positive (+) first, then negative (−) last.
- Reset the clock/date; the i-Cockpit screen reloads itself.
- Re-teach the one-touch windows — see our 308 window guide; re-initialise the sunroof too if fitted.
A matching 12 V battery doesn’t need coding on the 308.
Frequently Asked Questions
Negative or positive first on the 308?
Negative (−) off first and on last.
Does a new 308 battery need coding?
A like-for-like battery doesn’t — just re-teach the windows.
Will the radio lock?
No code is normally needed — just reset the clock.
Why won’t my windows auto-close now?
The power cut wiped their learned travel. Re-initialise to fix it.
Any warning light that stays lit? Look it up on autodtcs.com. To clear the service message, see our 308 Mk3 service reset.
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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