12v battery issues

BoatMad

My wife was talking to a MY14 leafer , and he mentioned multiple issues with the 12v battery going flat and leaving him stranded. He was not a happy camper

Personally I hadn't heard of this being an issue

Anyone hear of problems ?

Rafal

There are a good few long threads on speakev.com about 12V battery issues, which if someone experiences once seems to be plagued by, while the rest never gets any trouble at all. Sounds to me like some other fault that drains/affects the battery for those affected, rather than battery itself.

cros13

Besides the issues documented on SpeakEV there is also an issue with the 12v battery draining in certain situations where the vehicle is either left idle for over month or left connected to a charger for more than 14 days. In those situations the DC-DC converter doesn't run to charge the 12V battery and the telematics unit just runs the battery down.

BoatMad

cros13 wrote: »

Besides the issues documented on SpeakEV there is also an issue with the 12v battery draining in certain situations where the vehicle is either left idle for over month or left connected to a charger for more than 14 days. In those situations the DC-DC converter doesn't run to charge the 12V battery and the telematics unit just runs the battery down.

thats not too bad, as both are fairly extreme conditions.

The issue related to me , was a battery dying , while the car was in normal use

I don't think it's common, as cross said, the issue seemed to be more for people who leave the car connected to the EVSE too long.

Afaik, this issue was only with the Gen I.

Certainly no issue with mine.

BoatMad

Well fitting a standard starter battery to a car that draws 200-250w from that battery is a very poor decision

As per gen1 , most seems to be on the MY14 which is gen2

Where did you read that there is a 250 watt load on the 12 V battery when the car isn't in use ? it does seem excessive.

I think there could have been a couple of reasons for choosing Leaf acid, one was that afaik Lead Acid performs better in extreme cold.

And lead acid batteries are a lot cheaper which is probably the main reason. And if it fails it can be got almost anywhere.

I don't think I'd be worried about it really, from going through forums over the years it's obviously not a common problem, I'd imagine also the Leaf 12V to be a lot stressed because it doesn't have to crank and ICE and or heat glow plugs and crank a Diesel.

BoatMad

Deleted User wrote: »

Where did you read that there is a 250 watt load on the 12 V battery when the car isn't in use ? it does seem excessive.

I think there could have been a couple of reasons for choosing Leaf acid, one was that afaik Lead Acid performs better in extreme cold.

And lead acid batteries are a lot cheaper which is probably the main reason. And if it fails it can be got almost anywhere.

I don't think I'd be worried about it really, from going through forums over the years it's obviously not a common problem, I'd imagine also the Leaf 12V to be a lot stressed because it doesn't have to crank and ICE and or heat glow plugs and crank a Diesel.

SpeakEV mentioned 200- 250 W, thats far too much for a starter battery as a continuous draw. You need deep cycle lead acid for that type of usage ( beefier plates )

I would imagine if it was a real problem they would have solved it by now.