A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

Battery Charging Issue?

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Old Apr 20, 2009 | 06:56 PM
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Default Battery Charging Issue?

I just did my timing belt in my 2004 A6 2.7T (pain in the butt - I don't recommend it). When finished (2 days later) battery was too weak to turn over. I put my cheap old charger on it, it took a 10 Amp charge for about 30 minutes, then the horn on the car kind of "burped" and the charger quit charging. I repeated that process again tonight, with the same results. As I was removing the charger, I heard something in the engine compartment click, like it reset. So I hooked the charger back up, and it started charging again. Any ideas what is going on?
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Old Apr 21, 2009 | 02:55 AM
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The alarm is going off. Disconnect the battery before charging it...although it sounds like you need a new battery.
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Old Apr 21, 2009 | 07:49 AM
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I don't think it's the alarm going off. There is only one "chirp", right when the charger quits, and it is from the front horn. I thought the alarm horn was trunk mounted. I don't doubt that I could have a bad battery, though. Vehicle purchased 1 yr ago as certified used, so I have no idea how old the battery is.
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