Correct battery for C6 RS6 V10

5.0 V10 50v biturbo - 571 bhp
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Limited100
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Correct battery for C6 RS6 V10

Post by Limited100 » Thu Oct 09, 2025 11:57 am

Hi all,


My battery dropped from 100% to 10% in only 2 days.

I went for a 40 min drive and it got back to 80%, which suggest's it isn't the alternator but needs a new battery.

Which is the best to get?

I currently have this fitted: https://batterygroup.co.uk/batteries-by ... 092?c=1354

Perhaps there are better out there? Assuming if I get a different one then it'll need to be coded in.


Thanks
C6 RS6 Avant 2009 | Stock turbos | Wagner ICs | BMC filters | Secondary cats removed
Currently an unknown stage 1 map, making 658 bhp 805 NM on a hot day on Tesco 99, laggy but no boost leaks
Will not safely go to stage 2 confirmed by MRC because turbos already at 9x% duty, a mystery - engine out to diagnose
Runs ok, done 10k miles in it in 10 months, perhaps in the next couple of years will refurb turbos etc.
1000 bhp not viable because gearbox upgrade alone is £9k

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Jim Haseltine
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Re: Correct battery for C6 RS6 V10

Post by Jim Haseltine » Thu Oct 09, 2025 3:59 pm

All the quality brands are much the same. The battery function in the car needs to know there's a new battery so yes, it needs coding - but all that has to be done is to skip on the current code by one digit, there's no validation or anything like that.

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Limited100
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Re: Correct battery for C6 RS6 V10

Post by Limited100 » Thu Oct 09, 2025 7:55 pm

Jim Haseltine wrote:
Thu Oct 09, 2025 3:59 pm
All the quality brands are much the same. The battery function in the car needs to know there's a new battery so yes, it needs coding - but all that has to be done is to skip on the current code by one digit, there's no validation or anything like that.
Ok cheers Jim
C6 RS6 Avant 2009 | Stock turbos | Wagner ICs | BMC filters | Secondary cats removed
Currently an unknown stage 1 map, making 658 bhp 805 NM on a hot day on Tesco 99, laggy but no boost leaks
Will not safely go to stage 2 confirmed by MRC because turbos already at 9x% duty, a mystery - engine out to diagnose
Runs ok, done 10k miles in it in 10 months, perhaps in the next couple of years will refurb turbos etc.
1000 bhp not viable because gearbox upgrade alone is £9k

Explore Audi wall art

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Limited100
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Joined: Sat Nov 16, 2024 6:55 pm
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Re: Correct battery for C6 RS6 V10

Post by Limited100 » Sun Nov 02, 2025 11:06 am

After replacing the battery the fuel pump fuse blew. Thankfully my mechanic knew it was that and fixed right away, otherwise I'd have been left stranded!
C6 RS6 Avant 2009 | Stock turbos | Wagner ICs | BMC filters | Secondary cats removed
Currently an unknown stage 1 map, making 658 bhp 805 NM on a hot day on Tesco 99, laggy but no boost leaks
Will not safely go to stage 2 confirmed by MRC because turbos already at 9x% duty, a mystery - engine out to diagnose
Runs ok, done 10k miles in it in 10 months, perhaps in the next couple of years will refurb turbos etc.
1000 bhp not viable because gearbox upgrade alone is £9k

Explore Audi wall art

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