Indeed, YB10L-A2
The YB part is manufacturer code
i.e. you get a Yuasa one and that'll be the code, if you get a different brand, (like the one I got for my 650F1 today), you might have a different code
CB10L-A2 e.g.
You can have my slightly used old un if you like, only one cell dead, holds a steady 10.8V
If you're not in the forbidden postal zones of the UK like wot i is try these guys, cracking prices and v friendly comms, i'd have had one from them were it not for the pricey shipping to me
http://www.whitedogbikes.com/item--Dynavolt-YB10L-A2-12N10-3A-Motorcycle-Battery--yb10la2.html
£23 and £5.49 shipping, decent name, you'd be hard pressed to get one cheaper.