I take it is showing just above 12v when you put your key in? Thats normal unless you can hear it starting to struggle.
Im sure uk batteries are 005L
It never goes up though. Sits just above 12v at all time.
Is that normal then? The guague goes up to 16!
If that's normal I'll not bother replacing,
Excuse my zed ignorance. I've only been an owner for 10 hours (For example: It could be that all batteries in the UK charge to this level, but as no previous car has had a voltage indicator, I've lived in ignorance of this fact).