I have bit of kit to discuss here: First if you do not ride in the cold, then something like this Lithium will work for you. However, it is a total POS under 40F/4C. The box clearly states it's 480 LCA amps (this is not the same as CCA):
New Lithium battery
The battery I am currently on now is this:
YTX20HL-BS AGM Maintenance Free Battery This is my second winter on it so far. I have not yet put a tender or droplight for heat on the bike this year and it has started well. It has started at 19F/-7C for the coldest this year. I think this one will last through this winter as well. It is the fifth battery I have had since new.
Right now, my starting issues revolve around the negative cable getting loose every few weeks and I have to retighten it.
I hope this helps some....