Charging while parked & unused (over 2 weeks) in cold weather - recorded data

[PrimeRisk]

Yes, so true!

My curiosity stems from all the 12v battery failures in under 3years that have been reported on the forums and what is going on with that.

It also seems to be an issue on the Nissan Leaf forum I am on as well.

It is so ironic that with all that stored energy in the HVB, it isn't being used effectively to keep the 12v batteries topped off and healthy.

Hence my 2 AGM mode trickle chargers, one on the Leaf and one on the Lightning.

What year Leaf? I had a 2015 with the modem-hangup issue that would completely flatten the LVB in about 4 hours because the cell modem would phone home with status and never disconnect. I resorted to keeping a pair of needle nose pliers in the car and manually pulling the cell modem's fuse every night when I got home from work. Nissan had to replace the battery 5 times under warranty until they finally had a patch.

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[chl]

I think this could be accomplished with the appropriate logic , no changes needed to hardware at all.

Yes, maybe so...just put in code to fire up the AC-DC and DC-DC converters and activate the EVSE to connect to the grid when the truck is plugged in, if that can be done without needing to physically connect the HVB into the mix.

I going to have to review some of those old videos about the Lightning and see if I can glean anything from them about the hardware connections and control.

Ford must have all the info/details we'd need.

You'd hope that if it could be done easily they would have done it already with all the battery replacements under warranty and hassle owners have been put through.

Not to mention some other EV makers (except Tesla?) who seem to have the same issues with the 12v battery.

From what AI tells me about Tesla, they keep the 12v battery topped off from the HVB all the time, whether ON, OFF, charging or not, rain or shine,hot or cold.

Since cancelling the Lightning and moving to the Universal EV Platform, not gonna happen now I guess.

 

[chl]

What year Leaf? I had a 2015 with the modem-hangup issue that would completely flatten the LVB in about 4 hours because the cell modem would phone home with status and never disconnect. I resorted to keeping a pair of needle nose pliers in the car and manually pulling the cell modem's fuse every night when I got home from work. Nissan had to replace the battery 5 times under warranty until they finally had a patch.

I have a 2012.

The big drain on mine was apparently the charge timers.

Nissan put out a bulletin I think which said to turn them off when the Leaf is sitting unused for a while, but it came out sometime after I had a problem.

My 12v got discharged to the point I had to jump it with my 2001 Ranger after I was away for several weeks after I first bought it.

I had to buy a long jumper cable to reach it - it was nose first into the garage.

Ever since, I just keep it on a trickle charger in my garage - still on the original battery now 14 years later.

Batteries love to be at 100% and reward you with longevity!

And it is still a nice little local trip vehicle to this day.

 

[chl]

About the Teslas - got it from this back in 2023...alas, Ford has not fixed it apparently:

https://www.f150lightningforum.com/forum/threads/why-isnt-the-12v-battery-always-charged.14005/

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