I am thinking that in about 6 weeks, the season is over in my area. I went to the dealer today and he try to sell me the BMW "specially made" battery tender. I have a charger that works at 1.5 amp and has been doing the job for my previous motorcycles over winters. My concern is that it is written on the box of the charger " lead acid battery". It is an automatic charger which when fully charge, is floating keeping the charge. Am I taking a chance using this charger since the RS battery is AGM ? I sure don't want to damage the electronics.