I think the issue is more what battery you have fitted. If you have a standard loking wet battery as you would expect in a fairly new bike then accoprding to http://www.accumate.co.uk/MFBatteries.htm it should be okay.
If you have an 05' and the original GelCel, it requires the BMW badged charger becuase it has a special charging algorium. This comes from BMW and Deltran. I used my Battery Tender Plus when I first got the 05 LT last year and killed the battery in about a week.
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