I might also recommend Odyssey batteries. (AGM)
Plus's: Are made very well.. Brass connections (not lead)
Very Low internal resistance, can be drained dead many times and recover to full strength.
99.9% pure lead used (decreases sulfation) Can be shipped (buy online), and great storage longevity.
Minus's: Costly, don't have a lot of form factors - tough to find one that is drop in place.
I bought a PCM545MJ... I actually got it for same price as OEM replacement online. ($85 shipped to my door)
I have a 06 T660 4 Stroke.. and had no problems starting it on -20 mornings (and there were many for me last year)
It is about 2-3 lbs lighter and smaller than my OEM. I had to stack up some 1/4 thick rubber pads, beneath and on the side to make it fit in my tray.
They claim it is charged above 12.5 Volts.. you can store it for 2 years without touching it....
So far I love it.. although it is only one year old.
worth checking out..
http://www.odysseybatteries.com/battery/pc545series.htm
When you find the battery you need, type the model into google.. you may get a decent price on one.