Last year around September, I was told my 7 year old Varta battery was going. A sign was the fact the car revved higher at idle sometimes.....such as at the traffic lights.

I changed the battery to an equivalent Dek Intimidator and fixed the revving issue........until the last week.

It's starting to rev again at idle sometimes.

Has anyone had this issue before?

I've bought myself a battery analyser to see whether the new battery is starting to go faulty.....