Switches for running lights
If you don't ride at night,but just want to be visible while riding,are you going to use low draw LED lights like Kuryakyn small silver bullets? They are very bright,but don't cast a beam,so you really couldn't use them as headlights.
As far as the battery goes,battery size and wallet size go hand in hand [or pocket in our case]. I'm running these A123 battery packs in my motorcycle. You need 4 cells,each cell the size of a roll of quarters to get 12v. Your not using them to start your bike,but each 4 pack puts out 120cca.[I use 2 packs for 240cca because my bike is E start only and electronic ignition]. They can be discharged nearly dead for 1 to 2 THOUSAND times with no degradation,unlike a regular battery and charge quickly.