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A couple years really, it depend on how often it been recharged, we do have customer who managed to drain their in 6 months because of this.
If you just ride around, charge maybe once a week, or once every two weeks, it might last long enough says, 4 or 5 years with careful maintenance.
If you completely drain your battery and recharge it, this will result in a much shorter lifespan.
Thanks for the details! What's the safe lifespan of a quality battery, then?