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
Correct battery for C6 RS6 V10
- Limited100
- Neutral
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Correct battery for C6 RS6 V10
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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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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Jim Haseltine
- 4th Gear
- Posts: 908
- Joined: Mon Jan 04, 2016 2:26 pm
Re: Correct battery for C6 RS6 V10
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.
- Limited100
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- Joined: Sat Nov 16, 2024 6:55 pm
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Re: Correct battery for C6 RS6 V10
Ok cheers JimJim Haseltine wrote: ↑Thu Oct 09, 2025 3:59 pmAll 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.
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
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
- Limited100
- Neutral
- Posts: 20
- Joined: Sat Nov 16, 2024 6:55 pm
- Contact:
Re: Correct battery for C6 RS6 V10
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
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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