Audi A5 Coupe Battery: Specs, Fitment & Common Faults

On the A5, a persistent drain has genuinely been traced to the dash control panel unit on related models, not an electrical short.

Generation covered: this guide is for the second-generation A5 Coupe (F5 platform, 2016–2024) — the two-door coupe discontinued when Audi renamed the A4 saloon to A5 in 2024. These are entirely different cars despite sharing a name; if your car is a four-door saloon or estate bought new since 2024, this guide does not apply to it. Check your logbook or VIN if you're unsure which car you have.

Illustration for editorial purposes

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The Part Everyone Blames First, Not Always Correctly

Ask anyone why their Audi A5 Coupe 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.

OEM Part Number: 760-850A

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. "CE" = 92Ah AGM, "CF" = 105Ah AGM). Checking the suffix on your existing battery's label is a reliable way to confirm the exact replacement for the F5-generation A5.

Standard AGM fitment	92Ah AGM, 760-850A (EN) — suffix "CE"
S5/higher-demand variants	105Ah AGM — suffix "CF"
Genuine part number format	000915105 + two-letter suffix — confirm the exact suffix via your existing battery's label or VIN

Battery specification varies by engine and electrical equipment level, and the S5/RS5's higher electrical demands may require a different capacity to standard A5 versions. Like several other VW Group cars of this era, the A5 monitors battery condition electronically — some specialists recommend having a new battery registered to the car's system rather than assuming a straightforward swap is sufficient.

Audi A5 Coupe Battery: What It Does

On the Audi A5 Coupe, 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.

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A Genuinely Useful Piece of Context Worth Knowing About Persistent Drains — Audi A5 Coupe 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 A5 Coupe 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.