Audi A6 Battery: Specs, Fitment & Common Faults

On the A6, a persistent drain has genuinely been traced to the dash control panel unit on related models, not an electrical short.

Illustration for editorial purposes

Find Audi A6 Battery Here!

Opens live listings in a new tab.

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. "CF" = 105Ah AGM, "AK"/"DL" = 110Ah conventional). Checking the suffix on your existing battery's label is a reliable way to confirm the exact replacement, since A6 typically needs a higher-capacity battery than smaller Audis.

Standard AGM fitment	105Ah AGM, 950A (EN) — suffix "CF"
Higher-demand variants (S6/RS6)	Up to 110Ah — suffix "AK" or "DL"
Genuine part number format	000915105 + two-letter suffix — confirm the exact suffix via your existing battery's label or VIN

Audi A6 Battery: The Part Everyone Blames First, Not Always Correctly

Ask anyone why their Audi A6 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.

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.

Audi A6 Battery: What It Does

On the Audi A6, 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.

Find Audi A6 Battery Here!

Opens live listings in a new tab.

A Genuinely Useful Piece of Context Worth Knowing About Persistent Drains — Audi A6 Battery

If the battery keeps going flat despite everything appearing switched off, this is genuinely worth knowing: documented cases on related Audi models describe a persistent drain traced to the dash control panel unit itself rather than an electrical short or failing alternator, with replacing this specific component resolving the drain entirely.

A genuinely important finding worth knowing about the 48V mild hybrid system: alternator failure related to this system has been confirmed in the US with a seven-year extended warranty, though UK owners have found it difficult to get equivalent support from Audi UK for the same fault.

It's also genuinely worth knowing a useful diagnostic reading: a healthy trickle charge to the alarm typically measures around 0.03 amps, with anything notably higher pointing toward a genuine parasitic drain.

Audi A6 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 Audi Battery

The same part, covered across other Audi models.