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Parts used in this project:
Brushless Gearless Motor: http://bit.ly/2J82CZq
Controller with display: http://bit.ly/2J74zVQ
BMS Battery Protection Board: http://bit.ly/31Y1BLN
Sanyo 3500mAh cells: https://www.banggood.com/custlink/vKK...
48V battery charger: https://www.banggood.com/custlink/mvG...

If you do not have the opportunity to build your own battery, you can easily buy it ready online or in electric bicycle stores. 48V are the most popular batteries.

Good luck in your constructions!