Which Battery for '99 M900

[Bstiles]

Yesterday I bought a '99 M900. I'll pick it up tomorrow after work (freaking stoked!). This is my first Monster (actually my first bike on twenty years) and I've got a lot to learn. The owner explained that I'd need to replace the battery with a sealed type. I am trying to figure out which battery I need to buy. I've searched the forums and am unable to find out exactly which one fits (or should be made to fit).

Also I'm trying to get a handle on reliable parts sources so any vendor advice would be helpful as well. Thanks!

[Ddan]

YB16AL-A2

Sponsors to the left.

[Bstiles]

Thanks! Now to find one...

[txduc]

Or you can always go w/ an Odyssey PC680.  They're expensive and a bit heavy but turns the motor over (hi-comps) way better than others I've tried.