My bike's an '03, and I got the battery tender when new.
I hate to admit it, but I never even plugged the thing in.
The bike is stored in my Mom's garage, which is not heated,
but rarely goes below 32f. It has sat for weeks, or even
months, at a time without attention, with no appearent ill
effects.

I consider myself lucky in this respect, But plan on replacing
it over the winter.

My OEM batt in my p/u only lasted 1 year.
Uncle Charlie