KAISDA K2 20*4.0 inch Fat Tire CST Tire Off-road Folding Electric Moped Folding Bike Mountain Bicycle 500W Motor SHIMANO 7-Speeds Derailleur LCD ...

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Hello, Is there also a larger battery available or is this model battery with a larger capacity easy to find online? What about the guarantee of this bike i.e. the motor and battery? Thanks in advance