Captain Paranoid here, is it time to replace my starter battery

[the1andonly]

Ducato registered 2018 a 2017 model out of factory april 17. Low mileage. Currently starts a treat but in the words of Lenny HB is it worth £100 to risk the ECU issues, if it was a normal car, id just wait until it wouldn't start 2 days on the trot. I also wouldnt have a battery monitor attached either. As recommended by Richard n Ann I have A BM2 monitor ebay £20.
the last photo shows the last 2 weeks with the battery being charged by votronics duo controller.
the other 2 are from today and december. Its not goosed but why ignore the suggestion?

 

[Richard n Ann]

I fitted a new battery on the car after getting low voltage notifications, the cranking voltage was still 9v with the new battery on

 

[Lenny HB]

I don't think mine really need replacing but was it worth the risk. The old one has been sitting on the garage floor for 10 months untouched I charged it up 3 weeks ago & it is still up at 12.55v.

If I charge my car battery after a couple of days its down to 12.1v and in general use which is all local it never gets above12.1v but the car starts perfectly even after being left for weeks. That won't get changed until it dies, original battery coming up for 10 years old, the stop/start stopped working after the first couple of years thank goodness.

As for your Motorhome battery, I would change it not worth the risk of getting stuck in the middle of nowhere especially if you are in France or Spain.

As Richard says they often drop to 9v when cranking. You could do what I did, that was to disconnect all charging from it, check the current being drawn whilst parked up and monitor the voltage over a couple of weeks to get an idea of it's capacity.