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

OEM Part Number: 6R0915105

Accuracy note: as a Volkswagen Group model, the Ibiza shares genuine battery part numbers with sister VAG brands (VW, Audi, Skoda) — Seat's own catalogue has superseded older references to a common current number. Always confirm the exact size and technology against your existing battery's label or VIN before ordering.

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Superseded current reference	000915105EC — the number this range has been consolidated into across Seat, Skoda, Audi, and VW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

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.

A genuine, specific fix worth knowing about the factory head unit: some Ibiza head units are wired with a permanently live feed rather than a switched one, meaning the unit (and its battery draw) never fully switches off with the ignition. One documented fix involves swapping the yellow (switched live) and red (permanent live) wires at the unit's connector — considerably cheaper than a dealer's suggested full head unit replacement, though this should be attempted only if you're comfortable working with car electrics, since getting it wrong risks other electrical faults.

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.

The Part Everyone Blames First, Not Always Correctly

A car that won't start gets blamed on the battery more often than any other component, and it's right often enough to make that assumption a reasonable first check. But it's not always the actual cause, which is worth knowing before spending money on a replacement that doesn't 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.

What It Does

The 12V battery provides the power needed to start the engine and runs electrical systems when the engine isn't turning. On cars with stop-start technology, the battery works much harder than on older designs, since the engine switches off and restarts far more frequently — which is exactly why these cars need a specific AGM or EFB battery type rather than a standard unit.

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.