Very generally speaking if cared for, your battery should last 400 charge/discharge cycles before losing noticeable capacity. You could get up to 1,000 cycles or more if you never charge it above 80% capacity or discharge it below 20% and leave it 50% charged when not in use. Don't charge it when it's cold and don't let it get too hot by leaving it in the sun etc. Depends on how vigilant you want to be with it, if you're willing to sacrifice always ready to ride at 100% or are willing to make some compromises to extend it's life.
