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Well it's good they have a smart charger in there. The module needs to know age of battery to properly deal with the charging and management of. You can run without I'm sure but you will reduce your battery life.

My 2008 has a 5 year old battery - seems weak. 1 hour with the FM on and I can't restart.

PS: My Audi a8L with battery manager had the original battery in it 10 years! I put a new one in and it lasts forever running anything.
 

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Besides the low-battery life while listening to audio (engine off) I've had some odd events (e.g slow cranking/start, lights flickering, DVD player tanking the whole main screen, etc) which point to a crapped out battery. The Noco charger has restored some life. I put it on a conventional charger for a few hours - that killed it. Conventional chargers are nasty. Anyway, I bought an H8 Everstart from Walmart, charged it with the Genius Noco and is going in tomorrow. H8 is a pretty big battery - I'll do a voltage drop test on Audio only& I bet it's good for a few hours of use.
 

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I took out an h8 and replaced it with the new H8. Funny when I connected the ground, all the windows, sunroof opened. Starts with vigor now. I am going to connect the GAP tool and see if I need to recode the battery or anything. 2008 SC

I was at a shop and the guys were commenting about the 850's with two batteries. Holy cow electronics were consumptive back then. The Audi A8 they wanted to go 24 or 48V and should have. Would have solved a lot of supply issues, giving some breathing room there.

I also had a 93 V8Q "Verboten" on youtube if you want to see it. Drove it to the wrecker, nobody wanted it:(
Leaked from everywhere.
 

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The new battery is awesome - fires up so quickly. There is no coding or energy management on the 2008SC. The Audi's have that module and it serves to prolong battery life by improved charging cycles, etc. For example my 2004 A8L had the orig factory battery when I got it (10years old). Perhaps in 2010 that feature was added to the RR.

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BMW 850's seemed to be too much car for me. The 928GTS was a stretch. I actually like driving smaller engines. Same for the S8. I have a D3 A8L and right now the MMI Is tanked. I had replaced the control module, got that recoded - but it's now something else in the loop. 92 V8Q Speed - nice. Cool cars best AWD system- better than the D3 A8 I think.
 

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Just doing an new battery in the 2010 - i could NOT remove the ECU. The back clips are somehow snagged up the the brackets attached to body.
Almost as if a special tool (like for audio decks) is required???
So it was either take the body off ;) OR.... I removed the hood sw/bracket, pulled the wiper cowl back (popped it off 1/2 way), got the ECU wiring out of the way and was able to shoe-horn the battery out and new back in.

Old battery 12/2019 was reading low 12.3 V
New battery is at 12.75
 
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