"but I read in my Street 750 owners manual where it suggest not using a battery tender due to the type of battery these bikes have."
According to my OWNER'S MANUAL, page 92 right side, second paragraph "a Harley-Davidson ...tender is recommended." Further, it sites a: SUPERSMART BATTERY TENDER (94654-98B) as one to be used. This is [exactly] what I'm using at present. Am I misunderstanding something?