You do right not to worry Steve, I suppose we're fortunate as in if it's kaput when we go to start it all it does it bugger up our plans for taking the car out and you just use your DD, although I suppose if it was a DD it would give up the ghost gradually, become lazy etc to give you the heads up to get it changed
Mines still got the original battery in it from 2003... going change it thought as i'm fairly sure it's why my headlamp jets only work properly while driving