Battery failed just out of warranty, must have been unlucky as my own 905 bought at the same time is still going strong. We used to alternate the batteries too so...Hey Ho. New battery is £500 and my wife can no longer ride so not worth our while replacing it. Would make someone a great bike if they want to get a new battery, we will sell the bike at a very reasonable £175. This will provide the buyer with a £1300 bike for £675. Local delivery would probably be poss, Essex/Suffolk. Can be seen working (with my good battery).