12v Battery Needs Service

[dgatwood]

You can't just put an extra tap to some of the cells since that would result in an imbalanced pack and cause early failure. Tesla has since put a 12v feed from the HV pack to keep the 12v electronics powered and reduce the load on the 12v battery. So 12v battery failures shouldn't be as common on the cars with the newer HV packs.

Cool. Good to know that I probably won't have this issue, anyway.

That said, I was thinking more along the lines of multiple sets of taps, and switching between them, but a switched mode regulator hanging off the full power output would probably be simpler to implement.

 

[DerekH]

So is this battery like the ones in gasoline cars that will need to be replaced every 3-4 years anyway?

 

[MBK_BKLYN]

I just got this warning too. Called the SC, they should have a replacement battery in next week to swap out. What's odd is I also see the dashed yellow lines showing limited regenerative breaking, and limited power output. It's not all that cold here, maybe 48 degrees F. Could this be related to the 12V battery somehow? Searches don't seem to turn up anything.