Really? Ok tell me this: i have three bikes, one i ride daily (all year) one i ride weekends, and one my son "rides" when the temperature, barometric pressure, sun's position in the sky, and his feelings are all in perfect alignment. I put a tender on his bike. Should I switch it over to the weekend bike once in a while? put all 3 on a separate tender?
Probably wouldn't matter. I leave mine plugged in most all the time because I'm lazy.
But usually in the Summer I'll plug it in if I think I am not going to ride for 3 or 4 days. I like having the battery fully charged. Plus, you can get a Deltran tender jr. for $25 on Amazon.