2005 Audi A8 Battery Size
GarageDex's verified fitment data shows the 2005 Audi A8 uses a BCI Group 95R battery, rated about 850-950 cold cranking amps (Varies).
Key takeaways
- Battery: BCI Group 95R, 850-950 CCA, Varies.
- Replace with the same Group 95R.
- In cold weather, choose a battery at or above 950 CCA.
- It comes with a flooded battery; you can upgrade to AGM in the same group size.
- Battery type (OEM)
- Varies by factory option
- Cold cranking amps (CCA)
- 850-950
- Terminal position
- Reversed-terminal layout (R)
- Dimensions (L×W×H)
- 394×175×190 mm
The right battery for your 2005 Audi A8
Match the group size (Group 95R) and aim for at least 850 CCA - more in cold climates. A standard flooded battery is fine, or upgrade to AGM for longer life. A battery is heavy to ship, so buying in person can win once you count free install and the core-charge refund - but to compare prices and reviews:
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What does a 2005 Audi A8 battery cost?
The price depends on which battery option this car has: roughly $80-200 for a standard flooded battery, $200-235 for EFB, and $125-320 for AGM. Check the label on your current battery and buy the same group and type.
See the full breakdown of what car batteries cost - by type, by make, and what the extras actually add.
This car needs the battery registered
The battery type on this car depends on its factory option. If the battery you are removing is labeled AGM or EFB, the car has a smart charging system and the new battery should be registered to it, which a shop, a dealer, or an OBD-II tool that supports registration does in minutes. Audi is one of the makes where skipping that step shortens the new battery's life.
How battery registration works - what it does, and how to have it done.
What Group 95R means
A BCI group number describes the battery's physical size and terminal layout, not its power. It is what guarantees the battery drops into the tray and the cables reach the right posts. A Group 95R case measures roughly 394 × 175 × 190 mm. Reversed-terminal layout (R).
Group 95R is one of the less common sizes, at 0.2% of the vehicles we hold specs for. It is still a catalogued BCI size rather than anything exotic, but a smaller store may need to order it, so it is worth calling ahead.
How many cold cranking amps?
Aim for 850 CCA at minimum. Cold cranking amps measure how much current the battery can deliver at 0°F, which is the one moment a battery is really tested. The 850-950 range reflects the different batteries fitted across this vehicle's trims and options. Going above the OEM rating is safe and does no harm - the starter draws what it needs and no more, so a higher-CCA battery is not "too strong" for the car. It is worth paying for if you park outside in a cold climate, and largely wasted money if you do not. Going below 850 is the one thing to avoid, because that is where hard winter starts come from.
How long it should last
The warning signs are worth knowing because they are easy to miss: cranking that sounds slower than it used to, headlights that dim at idle and brighten when you rev, or a car that starts fine every day until the first cold morning and then does not. A battery rarely warns you twice.
Frequently asked
What size battery does a 2005 Audi A8 take?
The 2005 Audi A8 uses a BCI Group 95R battery, rated around 850-950 cold cranking amps.
Does the 2005 Audi A8 need an AGM battery?
It depends on the factory battery option. Check the label on the battery you are removing: if it says AGM or EFB, replace it with the same type, because the charging system is set up for it.
How many cold cranking amps (CCA) does it need?
Aim for roughly 850-950 CCA. Choosing at or above the OEM rating is fine; going below can cause hard starts in cold weather.
Where is the battery located on a 2005 Audi A8?
Check the engine bay first - that is where most vehicles carry the battery. Be aware that some models put it in the trunk or under a seat instead (many BMW and Mercedes-Benz models, plus the Chrysler 300 and Dodge Charger, among others), so if the engine bay has none, look there or in your owner's manual. Reversed-terminal layout (R).
How much does a 2005 Audi A8 battery cost?
The price depends on which battery option this car has: roughly $80-200 for a standard flooded battery, $200-235 for EFB, and $125-320 for AGM. Check the label on your current battery and buy the same group and type.
Does a 2005 Audi A8 battery need to be registered?
The battery type on this car depends on its factory option. If the battery you are removing is labeled AGM or EFB, the car has a smart charging system and the new battery should be registered to it, which a shop, a dealer, or an OBD-II tool that supports registration does in minutes. Audi is one of the makes where skipping that step shortens the new battery's life.
How long should a 2005 Audi A8 battery last?
Most batteries last three to five years.
Other vehicles that use Group 95R
What to look for in a Group 95R battery + every car that uses it →Group 95R is one of the most common battery group sizes in the US.
More verified specs for your 2005 Audi A8
Other vehicles that use a Group 95R battery
Group 95R is a common size, so the same battery fits many other vehicles - including: