I second Ross' suggestion. My LT has a gel battery so i can't be maintained on a conventional charger. I bought the BMW charger but I think any electronically-controlled one will do. I put the bike on charge if I don't use it for more than a week and it must have done something right because I'm still on the original battery, which is just over 7 years old.
I just use a cheapy Halfords charger which I plug into the 12V outlet on the lower left of the fairing every time I park up. I use a similar one on my Merc, and both the bike and the car are still on their original batteries.
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