Audi e-Tron Discussion forums for the electric Audi e-Tron SUV.

12V battery

 
Old 05-25-2019, 07:16 AM
  #31  
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Originally Posted by ted99 View Post
If the HV battery charges the 12v battery when the vehicle is "on", I think that's good enough to deal with the problems I've had with both BMW and Porsche. When I was doing a lot of in-town driving, the charging profile of those two cars would not run the alternator hard enough to replenish the 12v battery's use for the starter and after a couple of weeks of short stop driving the 12v battery would be "flat". I had to keep the cars on an auxillary charger. The HV battery surely has enough capacity to replenish the 12v battery quickly, plus there is no "starter" load. So, It appears that there is little chance of the 12v battery not being regularly recharged to full capacity. In my 2015 BMW, the 12v batteries were being replace as a matter of course at the 2-year point because the charging profile had the alternator feeding it only on coast down and over run (an attempt to maximize fuel efficiency). BMW found out that the 12v battery was never getting fully charged with short trip driving using this regime.
I issue I face is when I leave the car garaged for a few months when I go away to my seasonal home. With my ICE and my 2017 Leaf, I would put the 12v on a battery tender. Worked great and no issues when I returned. Audi strongly states NOT to charge the 12v. Bummer.
John (aka Daddio) is offline  
Old 05-25-2019, 07:37 AM
  #32  
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Originally Posted by John (aka Daddio) View Post
I issue I face is when I leave the car garaged for a few months when I go away to my seasonal home. With my ICE and my 2017 Leaf, I would put the 12v on a battery tender. Worked great and no issues when I returned. Audi strongly states NOT to charge the 12v. Bummer.
The manual does state that, however, I have a hard time believing that a 750mA battery tender Jr would cause any problems.

If you want to be safe, you can install a battery disconnect. That would make it safe to run the battery tender during that time.
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Old 05-25-2019, 08:11 PM
  #33  
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I was curious and I plugged in a cigar lighter volt meter. and am seeing 14.75 V as soon as I turn on the e-tron. That voltage reading means the e-tron is charging the battery, as normal "idling" voltage of a 12 V lead acid is < 12.8 V
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