If you're having trouble with the amount of power you are drawing, a bigger battery isn't going to help. It might mask the symptoms a bit, (if you put the bike on a charger between rides) but in the long run, you're going to have to upgrade your alternator to a ZZR alternator, or decrease how much you are drawing from the battery. LEDs can help with that. I run a set of LED driving lights where I used to use halogen lights. 54W total now where I used to have 110W. I've got an LED headlight that I like - 20W on low, 40W on high. (vs. 55/60 on standard H4) Replacing the running/brake/turn lights with LEDs can save some wattage, too, but you'll need to replace your blinker relay as well. And the dash lights can be replaced saving a few more watts.
How much wattage are your spot lights and running lights? (I wouldn't worry about the phone and GPS - those generally don't use enough to be an issue.)
HI, spots are about 50w, the running lights are led so only about 9w. Will replace the spots have ordered led spots from internet, i have changed dash bulbs to led so will now replace brake/turn etc too.
And if all else fails will change alternator ( got plenty of led bulbs) cheapest fix is best !!