My first lasted only 1 year - dead short in the battery. The second lasted 2 years - died during the NE Rally last year. I have no idea why so short a life - I use the bike frequently - almost daily from April through November, and whenever the temp is 45 or about in winter - and - I use a tender. I might do well some day to check the charging voltage - I might be "cookin'" them. Another thought is the batteries themselves - I may try another brand some day. These have all been the O.E.M batteries and dealer supplied - could be the batteries or the initial charge.
