Will not hold a charge

is there a drain on the battery when you have turned every thing off?
to test this you need a avo meeter even a cheep one will do, unhook the p+ lead from the battery and hook up the meeter set on amps if the meeter moves up, or down? there is a short some were, or a drain on the battery, i all ways hook up a solar charger to my bike if i leave it for a month or more,, it keeps the battery toped up,even over the winter months,,,(when its to cold to ride it!) im getting on in years now!!!
the only other thing's to do are check its charging ok and then test your bike's battery on a drop tester,,,,if the battery plates are bent - cracked or even have a small short in them its a new battery sorry,
i hope this has help you out, from 1 biker 2 another good luck

Time for battery replacement!