I would not be surprised if it is almost dead. 5 years appears to be
about the standard runtime for most car accessory batteries. [I've had
the one in my Leaf and a Nissan Altima both die around that timeframe..]
I don't know if the Tesla system is doing a calendar reminder, or if
they are doing diagnostics based upon the battery voltage and capacity.
Jay
On 7/28/25 21:27, Mark Hanson via EV wrote:
Hi Folks,
I got an alert on my 2021 Tesla-Y app to change the 12V aux lead battery
after about 4.5 years 126K miles of operation.
It looks like I need to go into the menu>service>PowerOff selection before
just plucking out the battery.
In the 2013 Leaf I just changed the 12V battery without fanfare. Also in
the 2020 Bolt after 5 years of operation.
Is 5 years the recommended aux 12V change interval? - or should I do a load
test first before just changing it at a fixed time/mileage interval?
Have a renewable energy day,
Mark
Mark E. Hanson
184 Vista Lane
Fincastle, VA 24090
540-473-1248 phone & FAX, 540-816-0812 cell
REEVA: community service RE & EV project club
Website: www.REEVAdiy.org (See Project Gallery)
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