I purchased an Alien Ocean 36V 26" kit in October 2009 and attached to a Haro Heartland DLX comfort bike. Everything has worked fine until recently when I have experienced a complete power failure on a regular short ride. This has now happened twice in roughly the same place suggesting perhaps that the battery is starting to lose its effectiveness. I have not done many miles in total over the past 21 months and have kept the battery charged up as recommended during the winter time. If I wait a few minutes I get the power again but this only lasts for a few yards and then power loss which is accompanied by an erratic flashing of the 5 spot power display. I also get increased whine from the motor before the cut out. It seems a little early for a failed battery in view of the distance I have done since new and the number of charges but I would welcome any thoughts from readers.