Seat Ibiza Battery: Specs, Fitment & Common Faults
A genuine, technical cause of persistent battery drain: incorrect BCM coding can keep the whole CANBUS network awake — plus a real fix for a permanently-live head unit.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: 6R0915105
| Genuine VAG reference (Ibiza Mk4/Mk5 era) | 6R0915105 / 6R0915105B (also cross-referenced as 1S0915105A, 4F0915105E, 7P0915105E) |
|---|---|
| Superseded current reference | 000915105EC — the number this range has been consolidated into across Seat, Skoda, Audi, and VW |
| Note | If your Ibiza has Start/Stop, confirm whether EFB or AGM technology is fitted before ordering, and have any replacement registered to the car's Battery Management System. |
A Genuine, Technical Cause Worth Knowing: Incorrect Factory BCM Coding — Seat Ibiza Battery
A genuinely specific, well-documented cause of persistent battery drain traces back to the Body Control Module (BCM) being coded incorrectly for the car's actual configuration — for example, coded as if the car has five doors when it genuinely only has three. When this happens, the module continuously looks for components that don't physically exist, which keeps the CANBUS network in an awake state rather than allowing it to properly sleep when the car is parked, draining the battery even with everything switched off correctly. Confirming the coding matches the car's genuine specification exactly (rather than assuming a generic Ibiza coding profile applies) requires careful matching of equipment codes — a specialist familiar with VCDS or the online SEAT parts/coding database can check this properly.
Separately, if you're specifically experiencing repeated flat batteries on an older Ibiza (broadly 2009-era) after the car has sat for just a few days, it's worth asking a specialist whether a documented ECU software update exists for your specific engine and build — several owners report a software update resolving this exact symptom pattern, though not every dealer is aware of it, so it's worth asking specifically rather than assuming one doesn't exist for your car.
Seat Ibiza Battery: The Part Everyone Blames First, Not Always Correctly
Ask anyone why their Seat Ibiza won't start and "the battery" is usually the first guess, and it's frequently correct, which makes it a reasonable starting point. It's not always right, though, so it's worth ruling out other causes before spending on a replacement that changes nothing.
Seat Ibiza Battery: What It Does
On the Seat Ibiza, powering the engine start and running electrics while the engine's stopped both fall to the 12V battery. Stop-start technology puts significantly more strain on it than older designs, thanks to how frequently the engine cycles — explaining why a specific AGM or EFB battery is needed rather than a standard unit.
Opens live listings in a new tab.
Seat Ibiza 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 Seat Battery
The same part, covered across other Seat models.