I just bought and installed the 500cc 20X battery. I had bought the Braille a year ago and kept on a tender but only started the bike a couple of times. I was customizing it so a lot of down time. Braille died. Maybe a battery needs to cycle to stay healthy? Load, discharge, recharge, etc etc???? I don't know but the 500cc fired it right up yesterday and went riding since the customizing is finally finished!!!