For 2 winters before the last one I frequently had starting issues. Had a tender as well but once in a while I'd either forget to connect it or the plug wouldn't be fully in the wall (why do they make those things so big and heavy? But I digress) or it simply didn't put enough charge in the battery. At that time my regular daily ride was about 20km - 10 each way. The problem was when the temp dropped below 1 or 2 degrees C. This winter I've been riding about 40km a day and didn't need to connect to the tender once. Same battery, same garaging; only difference is the distance I was riding each day. I still have the handy pigtail connector on the bike so I can plug-in in an instant if i feel the need ie. I'm parked in the open overnite, but the key seems to be miles and regular ones at that.