Saving Memory When Replacing the Battery

**mlandau33** · 05-24-2023 11:53 AM

2018 A6. While changing the battery, can I provide power for memory saving using a 12v source into
the 12v accessory outlet?

**WatchMeSpend** · 05-24-2023 04:49 PM

Originally Posted by mlandau33

2018 A6. While changing the battery, can I provide power for memory saving using a 12v source into
the 12v accessory outlet?

Anything wrong with the post under the hood??

**mlandau33** · 05-24-2023 04:59 PM

Originally Posted by WatchMeSpend

Anything wrong with the post under the hood??

I was going to use a 12v output of a lithium ion jumper.

**WatchMeSpend** · 05-24-2023 05:48 PM

I've charged the battery under the hood in my A4 through the cigarette lighter to get the car started when the hood was stuck closed. You would have to find a spot where the power is constant because the outlets may not be connected to the battery all the time unless in accessory mode. Went to run my tire pump a few weeks back and the trunk accessory outlet didn't work unless in accessory or the car was running.

**Alabama** · 05-24-2023 06:25 PM

Originally Posted by mlandau33

2018 A6. While changing the battery, can I provide power for memory saving using a 12v source into
the 12v accessory outlet?

Many folk on AZ report that they change their battery on C7 cars without using any trickle charger and do not lose memory (maybe Audi started using NVRAM). Are you sure you need to do this?

**mlandau33** · 05-24-2023 08:30 PM

Not sure about the non-volatile memory. Being a 2018 (built more than six years ago), I am guessing that the odds are less so. I already have the jump starter, so I figured I'd play it safe. It's the wife's car, so there is no room for messing it up.

**Valpo A7** · 05-25-2023 04:42 AM

Had my battery disconnected for an extended period of time when I did the timing chains. When I turned the car on after repairs it had the correct date and time as well as all my radio presets. No issues at all.