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I changed the original chinese battery a TOMO 23a 12v super Alkaline for a Duracell M21/23 in my wireless cycle computer and it doesn't work ,put the old battery back in works fine . The old battery 11.6v new battery 12.3v . Can anyone tell me is there a diference between the batteries.

Hi , can anyone tell me why my 2 year old Wisper 905se some times surges as I am riding in any mode. It doesn't seem to do it when I first ride the bike it seems to do it when I remount after half an hour or so. It does settle down after a while . I don't ride in the rain so I don't think it's...

I bought a new Wisper Sport 905 in October 2010. The reason I bought the bike was to get me out and about and get some exercise, because my elderly dog , full of arthritis , could not walk far so I used to nip off and have the odd hour or two to myself. But things have changed , the dog has died...