From:
http://www.ninebotus.com/faq/
Question: How far can I travel on a Ninebot?
Answer: On a fully charged battery (dependent on rider’s weight) travel can range between 14 to 18.5 miles.
Question: How does Ninebot Inc. provide Warranty service?
Answer: Warranty service is provided by the Vendor (seller). If the vendor does not offer Warranty services you will need to contact Ninebot Inc.. You may be required to ship you Ninebot to China for warranty service or repairs.
Question: How many batteries does the Ninebot-E use/have?
Answer: One