Battery failure

[stani]

https://www.which.co.uk/news/article/revealed-the-surprising-fault-affecting-new-hybrids-and-evs-aWHWT7y2J77y

Honda not the worst but a problem we know

Yes, it's well written in that article. Now I know where the problem was with my Jazz - I drove very little in the winter (about once a week and a very short route) + then tried to update the system with the car not started.

[5thcivic]

Its obvious, manufacturers have over estimated the effectiveness of the main battery and have either just saved money on the 12V battery or under estimated the standby drain of all the electronic systems when switched off for circumstance at the end of the customer useage curve for low milage.

It would be a simple matter to monitor the 12V voltage when off and use the larger li-ion battery for a top up, but that would entail even more power useage when off, even if a intermittent timed measurement, say every hour. That power useage might affect the range figure, and that marketing number is now number one for advertising electric, and may just affect the mpg of hybrids too.

[stani]

5thcivic: A simple warning about the impending discharge of the 12V battery would be enough.
The system has a lot of warnings, but strangely not about the 12V battery.

[Jazzik]

https://www.which.co.uk/news/article/revealed-the-surprising-fault-affecting-new-hybrids-and-evs-aWHWT7y2J77y

Honda not the worst but a problem we know

Yes, it's well written in that article. Now I know where the problem was with my Jazz - I drove very little in the winter (about once a week and a very short route) + then tried to update the system with the car not started.

So, a clear example of point 2...

My two questions were:
1. Who among you has ever been unable to start the Jazz due to a dead 12-volt battery?
2. Was the battery perhaps discharged due to your own fault then? (Meaning: fumbling around with electricity consumers without having te car in "ready"?)

[jasonevans]

The problem with modern cars is there never really OFF as such.
Even when you lock the car the alarm , GPS etc are on draining voltage.
Hence why you need to go on a run every now and again to keep charge in the battery if you do very short journeys.

[coldstart]

...
It would be a simple matter to monitor the 12V voltage when off and use the larger li-ion battery for a top up
...

... and thereby risk a depleted HV-battery?
The 12V battery is quite easy to replace/recharge or jump start, whereas a completely drained HV-battery would be a catastrophic failure!