I have a 2009 K13S, I got it last summer. I live in Finland, so season is not that long. I stored my bike to a warm storage on September and connected Optimate 4 charger to power outlet. Outlet was open and Optimate was set to CAN-bus mode. Everything went just fine for 3 months, but after that started problems. I visited storage room to say hello to my bike, but I noticed battery was totally dead. I connected the charger directly to battery (and obviously disconnected the battery from the bike) and let it recharge for a while. After connecting battery back I started the bike and it started just fine, but when I turn it off, head ligths stay on, even if I take key away. At the same time I see warning lampf, just if my bike's head lamp would be dead, but it's not. What is going on, does anyone know?