Audi A4 Battery: Specs, Fitment & Common Faults
On the A4, a persistent drain has genuinely been traced to the dash control panel unit on related models, not an electrical short.
Illustration for editorial purposes
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OEM Part Number: 760-850A
| Standard AGM fitment | 92Ah AGM, 760-850A (EN) — suffix "CE" |
|---|---|
| Higher-demand variants (S4/S-Line, larger diesel) | 105Ah AGM — suffix "CF" |
| Genuine part number format | 000915105 + two-letter suffix — confirm the exact suffix via your existing battery's label or VIN |
Audi A4 Battery: The Part Everyone Blames First, Not Always Correctly
On the Audi A4, the battery takes the blame for most no-start situations, and often rightly so — it's a sensible first check. But it isn't always the genuine cause, which is worth establishing before paying for a new one that turns out not to solve anything.
Audi A4 Battery: What It Does
The Audi A4's 12V battery handles engine starts and keeps electrical systems running whenever the engine isn't. On stop-start versions, that job gets much harder, since the engine switches off and restarts constantly — which is why it specifically needs an AGM or EFB battery, not a standard one.
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A Genuinely Useful Piece of Context Worth Knowing About Persistent Drains — Audi A4 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.
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 A4 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.