4 hours ago, AmbitiousCubone said:

Do I need to get out more, probably yes!

Agreed, or buy a television 🤣

Resurrecting this thread, as I'm now very confused!

Have been checking the battery voltage every so often since my last comment on this thread - and it's never really got below 12.42V. This is after popping the bonnet, locking the car - leaving for an hour and coming back and measuring the voltage. Everything has been working absolutely fine - interior lights, 12V socket, etc.

Come to use the car today, and the interior lights didn't come on at all - very strange as it was showing 12.50V only 2 days ago. Did the same as above, and checked the voltage - still at 12.50V.

So the battery on the car is at 12.50V, which should be at 90% SoC - but I don't have interior lights? Could there be an issue with the BMS that would cause this?

On 12/27/2024 at 5:43 PM, AmbitiousCubone said:

Do I need to get out more, probably yes! Especially if it's going to help charging the battery on these damn cars!

I can only refer you to your earlier comment!😀

2 minutes ago, Eric Bloodaxe said:

I can only refer you to your earlier comment!😀

But at 90% SoC, surely that should be enough for stuff to function? There's only so much more charge the battery can take?

53 minutes ago, AmbitiousCubone said:

But at 90% SoC, surely that should be enough for stuff to function? There's only so much more charge the battery can take?

Tbh, after 18 months of this with the current car, and 5 years with the previous one, I'm not really bothered anymore provided it starts first touch - which it does, even in the recent sub-zero temperatures.

As I've mentioned, my usage now is low and fairly irregular. I'm pretty confident that if I was still doing 35k miles per year and driving daily, I wouldn't have an issue.

One interesting point I have noticed is this. I've done long runs - say, 200+ miles in a day, and next morning, no interior lights. Recently I've had a couple of weeks where I've driven almost daily, but only short runs - 10 miles or so - and the interior lights have kept working.

This seems counterintuitive when normal dealer advice is "give it a run to the coast", but perhaps "little and often" is better?😀

The thread has gone through various options at some length on this. Fundamentally, you can either:

- accept what is admittedly an unsatisfactory situation (ie that modern charging systems are not as effective as they should be) and continue to mitigate this as best you can through regular charging and/or use and possibly buy a new Yuasa battery as suggested

- or pursue the matter further with Ford (risking that diagnostic fee as discussed), and hope you get somewhere.

Unless anyone can come up.with a new suggestion.........

(PS From time to time, to illustrate that this is not exclusively a Ford issue, I mention the similar 12v battery thread on the Toyota Yaris forum, which has now reached 138 pages and over 3,400 posts!😀)

 

3 hours ago, AmbitiousCubone said:

Could there be an issue with the BMS that would cause this?

Go on, reset the BMS, I know you want to 🎉

There's not a snowballs chance in hell that your SOC is at 90% not unless you have directly connected the battery to a nuclear power station. 🤣

How accurate is your multimeter? Are you measuring the voltage directly across the battery terminals? Is the engine off?

1 hour ago, unofix said:

How accurate is your multimeter?

I've certainly never seen more than 12.42v on either of my Fiestas.

1 hour ago, unofix said:

Go on, reset the BMS, I know you want to 🎉

But see the latest post on the similar Focus thread😀:

8 minutes ago, psruk said:

I have been having the same issues for 2 years. Every time I go back they just keep telling me they can't find an issue. They have changed BMS but that's all I have got out of them. 

Proper fed up with it, not getting another. Going to move to something else. 😕