How long will the battery last before it needs replacing?

Battery life depends on use and conditions and, even with proper care, rechargeable batteries won't last forever. Conservatively, our Li-Ion battery will last about 500–750 cycles.

A partial charge/ discharge counts fractionally against those numbers; so running the battery down halfway then recharging it completely uses up one half of a charge cycle.

“End of useful life” refers to the point at which a battery can no longer supply 70% of its original rated capacity in ampere-hours. After this point, the aging process will accelerate and the battery will need to be replaced.

So, it'll depend on how often you ride and charge - but expect more than 500 charge cycles before you need to stress about batteries.