Where is the battery on a DB11?

[McButterpants]

This feels like a silly question but i just cannot find any information on where the battery is on a 2019 DB11 AMR.

I can see that the DB9 has the battery under the rear right hand side seat, but i cannot pull the seat cushion up the way the videos show. I doubt it is there.

Here is the reason i am looking to check it..or replace it:

I am having issues at times with a slightly rough idle until warmed up, not every time i start the car. And last week after a car show my CEL came on. Someone suggested that it could be from a low battery voltage, i had the hood up for a few hours if that matters. With the car off i put a cheap OBD2 reader on and it showed no engine codes. I will need to try again with the car on maybe..haven't had time.

I checked my voltage when the car is off, 12.1-12.2, i then used a ctek charger on the jump points (i ordered a mag connection for the trunk one) and got it up to 12.7-12.8 when off. As i am checking (using the jump points) i can see the voltage slowly drop. Maybe i have a parasitic draw.
I left the charger off and an hour later it is 12.2v.

So where is this battery?? Thanks

[1690cc]

This is from sixspeedoline

Under the right rear seat cushion, 2 bolts holding cushioning from front lower side and 3 clips at back of cushion, once the cushion is out it's fairly straight forward.

[McButterpants]

1690cc said:

This is from sixspeedoline

Under the right rear seat cushion, 2 bolts holding cushioning from front lower side and 3 clips at back of cushion, once the cushion is out it's fairly straight forward.

Thanks! I guess that explains why i could not pull the seat cushion up..I wasn't strong enough

[Calinours]

A fully charged lead acid battery should settle (about 1hr after engine off) at 12.5V with no load.

If your battery is settling below that, it is no longer holding a full charge. 12.2V would equate to about 60% capacity remaining. The dying battery will be placing strain on other electrical components and systems.

I would suggest you replace your battery asap.

[Simpo Two]

One other thing comes to mind - how accurate are the voltage readouts? Are they accurate to 0.1V? How true is a reading of '12.2V'?

[McButterpants]

Calinours said:

A fully charged lead acid battery should settle (about 1hr after engine off) at 12.5V with no load.

I didn’t know about the settling, makes sense now compared to what I was seeing. I’ll change it out now that I know how to get to it. It must be the original battery.

[McButterpants]

Simpo Two said:

One other thing comes to mind - how accurate are the voltage readouts? Are they accurate to 0.1V? How true is a reading of '12.2V'?

Good question. I have reason to believe it’s accurate. I’m not using an expensive multimeter but I use it for some electronics projects for low voltage and I use it to check small batteries.

I have a variable power supply that I can set to something like 5.3 volts and I test that with this meter. Always matches the designated output.