4 years is about the expected lifetime on average. The big problem with EV 12v batteries is unless they have a system to detect low capacity, one day you are just stuck, and usually in a bad time/place in the middle of bad weather. On ICE cars you get a warning when it starts to crank slow, no such warning on an EV, so it's up to internal metrology, or it's just dead one morning.
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) On Tue, Jul 29, 2025 at 10:45 AM Jay Summet via EV <[email protected]> wrote: > Our leaf is a daily driver in Florida so 80-90 degree weather in the > summer. You can see a photo of the failed battery here: > > > https://www.summet.com/blog/2019/05/03/nissan-leaf-12-volt-accessory-battery-replacement/ > > It had blue crystals forming around the top of one of the terminals, so > was definitely outguessing / leaking under pressure. > > Jay > > On 7/29/25 13:27, Lee Hart via EV wrote: > >> 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..] > > > > > > Interesting. Maybe it has something to do with the quality of the > battery, the climate where you live, or how often you use the vehicle? > > > > Our 2013 Leaf and 2014 Prius Plug-in still have their original 12v > batteries. The original 12v battery in our 2001 Prius didn't get replaced > until 2012, and the replacement is still working. My 2010 Chevy Colorado > pickup had the battery replaced in 2018, and is still running on the > replacement. > > > > The Leaf is a daily driver. The two Prius aren't driven often, but both > have roughly 1 foot square PV panels to charge them so the battery doesn't > go dead from sitting. Since the pickup is rarely driven, I have a Battery > Tender on it to keep it charged. > > > > _______________________________________________ > > Address messages to [email protected] > > No other addresses in TO and CC fields > > HELP: http://www.evdl.org/help/ > > > > _______________________________________________ > 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/a6442600/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
