I had my 59 Jazz for six years and I had to change the battery twice. The first battery was a premium RAC one and I couldn't believe it when it failed within the warranty period. The RAC came out and tested it said it was okay and refused to honour the guarantee. That cost me £30.
When the battery failed again a few weeks later I got my local garage to fit a cheap one. It seems the small battery on a Jazz works very hard and needs replacing every few years
My advice is just get a cheap one as soon as you start getting problems .