www.HalloMotor.com via YouTube
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Turn ordinary wheelchair into electric wheelchair
https://hallomotor.com/products/hallomotor-36v-250w-e-wheelchair-tractor-attachment-handcycle-handbike-kit-36v-9ah-battery-with-2a-charger
https://hallomotor.com/products/16inch-36v-250w-350w-500w-diy-electric-handcycle-wheelchair-attachment-handbike-conversion-kit-with-8-8ah-or-10-4ah-or-11-6ah-battery