Peugeot 308 Battery: Specs, Fitment & Common Faults

On the 308, check the genuine conditions that legitimately prevent stop-start from engaging — plus a real, expensive case showing even a new module and battery don't always fully fix it.

Illustration for editorial purposes

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Peugeot 308 Battery: OEM Part Number

Accuracy note: confirmed for the current Mk3 308 with Start/Stop — always check against your existing battery's label or VIN, since earlier generations differ.

Standard Start/Stop fitment	Type 027, EFB, 60Ah, 560A (EN)
Important	Never fit a standard lead-acid battery in place of EFB on a Start/Stop car — this will cause premature failure and can trigger warning lights. Some Stellantis Start/Stop vehicles also need the battery management system reset with a diagnostic tool after fitting.

Before Assuming a Fault: Stop-Start Has Genuine Conditions for When It Won't Engage — Peugeot 308 Battery

A genuinely common source of "my stop-start doesn't work" confusion is worth ruling out first: Peugeot's own manual lists specific conditions where the system deliberately won't activate, including being on a steep slope, the driver's door being open, the seatbelt unfastened, not yet having reached 6mph since the last start, the electric parking brake being applied, or the system needing the engine running to maintain cabin temperature or demist the windscreen. If your stop-start seems inconsistent, it's worth checking whether one of these genuinely explains it before assuming a fault.

A genuinely important, real account worth knowing about if stop-start still won't work reliably after ruling out the above: one owner had a new Battery Protection Module fitted (costing around £400) along with a genuine replacement battery, and stop-start still only activated infrequently even after a long motorway run. Separately, a Peugeot dealer's own service manager reportedly experienced the identical fault on his own car despite twice-daily 45-minute motorway journeys, suggesting these later systems are genuinely sensitive to battery charge state in a way that even consistent long-distance driving doesn't always resolve. This is worth knowing simply to set realistic expectations — an expensive module and battery replacement doesn't guarantee a permanent fix.

It's also worth knowing that a genuine battery issue can cascade into seemingly unrelated faults on Stellantis vehicles — electric parking brake warnings, wipers stopping working, and economy mode activating together are a documented pattern after a battery is disconnected and reconnected, generally resolving once the car's systems are properly reset by a specialist rather than simply refitting the battery and expecting everything to recover on its own.

Peugeot 308 Battery: The Part Everyone Blames First, Not Always Correctly

On the Peugeot 308, 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.

Peugeot 308 Battery: What It Does

Whenever the Peugeot 308'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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Peugeot 308 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 Peugeot Battery

The same part, covered across other Peugeot models.