Here's a 12V battery puzzle. I owned my 2011 Leaf for about 12 years. I
never replaced the battery and the car electronics still functioned
perfectly. It was always parked outside, so the I assume the small solar
panel kept that battery fully charged while the car was parked. Other
than that, I can't imagine I did anything differently than normal.
Peri
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------ Original Message ------
From: "Darryl McMahon via EV" <[email protected]>
To: [email protected]
Cc: "Darryl McMahon" <[email protected]>
Sent: 01-Aug-26 06:57:12
Subject: [EVDL] Re: Keeping a 2017 Nissan Leaf
Interesting. I had battery maintainers (either solar on dash or plug-in) on
all my ICE vehicles over the years. Mostly because they typically didn't move
for weeks at a time as there was pretty much always an EV of some kind in the
driveway to do most of my trips.
It didn't occur to me to put one on the Leaf due to the big DC-DC converter
from the traction pack that should be maintaining the 12-volt auxiliary.
I'm content that the failed 12-volt battery had served its time and I think
served past its expected life.
As for battery maintainers, I can come up with one of those pretty easily (I
sell an intelligent version). I should put one on the current gasser - my SO
will love having an electric plug hanging out from the front grill (actually,
not so much). Not so unusual around here where we still have a lot of gassers
with either battery blankets or block heaters or both to improve chance of
engine starts on truly cold days. (Back in my pre-OEM EV days, I carried jumper
cables so I could tap the traction pack to jump start frozen gassers on the
cold days. Can't do that now on the factory EVs because I can't tap the pack
or boost from the auxiliary per the owner's manual. So now I carry one of the
tiny jump packs for that purpose.)
On 2026-08-01 1:08 a.m., Bryce Nesbitt wrote:
That's exactly what the leaf does with a flat 12V battery.
Just replace it, and put the new one on a battery maintainer. Under
$200 at Batteries & Bulbs, expect a 3 year lifetime for the 12v
battery, maye 4 with the maintainer.
-- Darryl McMahon
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