Audi A1 Battery: Specs, Fitment & Common Faults

A genuinely important, confirmed finding: 48V mild hybrid alternator failure has a 7-year US extended warranty, but UK owners have struggled to get equivalent support from Audi UK for the same fault.

Illustration for editorial purposes

OEM Part Number: 000915105

Genuinely useful to know: Audi's current genuine battery part numbers follow a consistent pattern — 000915105 followed by a two-letter suffix that encodes the exact capacity and technology (e.g. "DD" = 60Ah conventional, "EB" = 59Ah EFB, "CB" = 58Ah AGM). Checking the suffix on your existing battery's label against Audi's own reference table is a reliable way to confirm the exact replacement needed.

Standard Start/Stop fitment (EFB)	Type 027 (L2), 60Ah, 640A (EN)
AGM fitment, higher-demand variants	Type L3 (096), 70Ah, 760A (EN)
Genuine part number format	000915105 + two-letter suffix (e.g. 000915105DD) — confirm the exact suffix via your existing battery's label or VIN

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.

A Genuinely Important, Confirmed Finding Worth Knowing

If you own a model fitted with the 48V mild hybrid system, this is genuinely worth knowing: alternator failure specifically related to this system has been confirmed in the US with an extended warranty of seven years covering this exact issue. UK owners have documented finding it genuinely difficult to get equivalent information or support directly from Audi UK for the same fault — worth persisting and specifically referencing the US extended warranty coverage when raising this issue with a UK dealer.

A genuinely useful diagnostic reading worth knowing: a healthy trickle charge to the alarm system typically measures around 0.03 amps at rest, so anything notably higher than this when tested with a multimeter points toward a genuine parasitic drain worth investigating further.

It's also genuinely worth knowing a practical concern worth addressing before replacing the battery yourself: disconnecting the old battery can result in various computer settings being lost, worth using a proper memory-saving device during the swap to avoid having to reconfigure these afterward.

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 Audi Battery

The same part, covered across other Audi models.