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battery life

  1. is 2 yrs reasonable life expectancy for original battery?

    Off-Road / Enduro
    Didin't ride my 2 yr old EXC400R for a couple of months over the winter and when I came to ride it for the first time, I found the battery was flat (weather was less than 10 celcius). Bumped it and went for a 3 hr ride. No problems next ride (weather was slightly warmer). Last ride, it started...