I am about to buy a new battery for my XL1200 when the riding season over here in the UK comes around. There seem to be many options put there quoting CCA,or Cold Cranking Amps. The last battery I bought a couple of years ago stated 'High cranking capacity'. It now loses its charge quickly, but when it was fully charged, the whole bike jolted on starting with a loud noise as if something had overloaded. Has anyone got any idea why this happened? Is high CCA important? Any recommendations which brand of battery is good? All information will be very useful, Thanks.