2015 Focus: Battery has low charge

[CrouchingWayne]

I’ve got a 2015 Focus and find the stop/start doesn’t tend to be available for use - not a huge problem, if anything a great feature…

However recently the ICE screen has been going blank or displaying a low voltage warning.

Looking online this is battery related - is it best to change the battery (my default), or is it something to do with charging ‘mode’ that needs adjusted? Some forums talk about the battery charging not being set to full power from the factory and this can impact the stop/start.

I can change the battery - no issue - but no point wasting money if it’s just a setting I can flip on!