At least on 3/Y, It's got a proper temp-compensated 3-stage algorithm. They have a current shunt and temp probe on the battery.
The algorithm calculates the usable amp-hours and when it drops below a threshold depending on battery type it will set the alert. Newer cars ditched the lead-acid for lithium-ion, and I haven't seen one go bad yet unless it's allowed to go dead. On Tue, Jul 29, 2025 at 12:28 PM Lee Hart via EV <[email protected]> wrote: > > I'd say once it gets past the 4 year mark, it's worth replacing just for > > peace of mind unless you have a way to test it. (Such as what Teslas do) > > I'm curious... what DO Teslas do to tend to their 12v batteries? > -- > Excellence does not require perfection. -- Henry James > But it *does* require attention to detail! -- Lee Hart > -- > Lee A. Hart https://www.sunrise-ev.com > > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250729/3bb8f4ad/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
