| I have the hawker Oddesy 680 gel. Great battery, but big heavy and slightly larger than standard. That said, it fits into the standard plastic tray with a little teak on the laoer lip.
A lot of people go for the smaller Yuasa YTXJ7BS battery. It's sealed and maint. free but I really wanted something that I could trust if I was away for a week or two on a continental tour. The latest mod seems to be this little fella in a KTM tray. | 
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