A friend has a 2011 F650GS that has a stock AGM battery. He left the ignition switch on after coming home in a downpour related to hurricane Isaac. The bike was left like that for a day or two. When I took the battery out it was DOA. . . nothing when turning the key. Should I try and have it charged or is it a waste of time being left so long like that. Would that be covered under his warranty? What is a good aftermarket replacement for this bike. I own a K1200RS with an Odyssey battery going on 7 years now and nearly all of that without using a battery tender. If an Odyssey is available for his bike I would be all for that. Also, will there be any issues with his computer after the install (needing to be reset or anything like that)?