I have a HaiBike AllMtn SL which uses the Yamaha system. I've run it ragged commuting to work every day and the battery is starting to degrade. I thought Pah! ill just buy a new battery...Then I found out there is literally nowhere online I can buy one from! Is anyone else in the same boat? Does anyone know where I could get one? I could open the thing and replace the cells but that sounds like a LOT of work.