Hi Rrae
I have my battery 2 years, well it was faulty after 6 months, so suppose this one is only really 20 months

but I met my Consultant in the supermarket one day, of all places!!!!!
He asked how I was etc and he remarked that he would hope that I get anything from 7/10 years out of my battery. Imagine that. Wouldn't it be fantastic. But as you say depends how you use it and look after it too.
Great thread though
Hope your keeping well.
Jackie