https://www.techtronic.site/bafang-bbshd-bbs03-48-52v-1000w-mid-motor-ebike-conversion-kit-with-large-capacity-lithium-battery-and-charger-diy-electric-bike-motor-kit/
BAFANG BBSHD BBS03 48/52V 1000W Mid Motor Ebike Conversion Kit with Large Capacity Lithium Battery and Charger DIY Electric Bike Motor Kit