On 14/12/2020 13:04, R D S wrote:
I happened to have a meter in my hand today so checked it and it's
reading 12.1v which is quite low. Battery life generally being 4-6 years
and us having had the car 4.5 years i'm thinking shall I just replace it?

You what??

I've changed the battery on my car. I might possibly have changed it
twice, but I don't think I have.

It was new in 2000.

OTOH it's not stop-start.

Andy