How much would 6 12v 7ah batteries last me when riding?

Assuming you intend to put them all in series to make a 72v nominal bank, the total of 6 batteries at 7ah is 7 amp hours. So if this controller realisticly pulls 50 amps as rated, 7 divided by 50 is 0.14. 0.14 times 60 minutes in an hour means about 8.5 minutes run time at full throttle till bank depletion. Of course, if you are using half throttle at half the amp draw, you get twice the time. See?

Can i safely use a 20s lipo battery 4000mah and 25C for the 72v?

Yes . I have used similar set up and worked fine . This motor can also be overvolted but that will lower its total lifespan.

I want to buy this motor to put in a dyi drift trike, do you think it would have enough torque for that?

Motor is capable of producing 5Nm of torque. Golf cart motors are around the 7-12Nm range. Higher gear ratios give more torque but less top speed.

Will this motor run full-speed in both forward and reverse?

The motor will run at 100% speed forwards and 50% speed in reverse.

72v3000w Motor Kits | Desertcart New Zealand

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NZ$1074

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power Your Ride, Own the Streets!

POWERHOUSE PERFORMANCE - Unleash 3000W of brushless motor power for thrilling acceleration and hill-climbing dominance.
UNIVERSAL COMPATIBILITY - Perfect for electric scooters, mini motorcycles, go-karts, and DIY conversions—your all-in-one e-mobility upgrade.
ADVANCED 24 MOSFET CONTROLLER - Experience smooth, efficient control with a smart 50A controller featuring 3-speed modes and reverse function.
INTUITIVE THROTTLE PEDAL KIT - Includes ergonomic twist throttle and foot pedal for precise speed control and effortless riding experience.
DURABLE ALUMINUM COPPER BUILD - Engineered with heat-resistant aluminum and full copper coils for long-lasting, low-noise operation.

The Kunray BLDC 72V 3000W Brushless Motor Kit is a high-performance electric motor conversion set designed for scooters, motorcycles, and DIY projects. Featuring a robust 72V system, 3000W peak power, and a smart 24-mosfet 50A controller with multi-speed and reverse functions, it delivers efficient, quiet, and durable operation. Built with premium aluminum and copper components, this kit ensures long life and heat resistance, making it the ultimate upgrade for millennial professionals seeking cutting-edge e-mobility solutions.

Specifications

ASIN	B07KR2FN89
Best Sellers Rank	#218,052 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #44 in Scooter Motors
Brand Name	Kunray
Customer Reviews	4.0 4.0 out of 5 stars (163)
Horsepower	3000 Watts
Item Dimensions W x H	5.28"W x 4.41"H
Item Weight	8 Kilograms
Manufacturer	Kunray
Material Type	Aluminum Copper Rubber Acrylonitrile Butadiene Styrene
Model	kunray
Model Name	Electric Brushless DC Motor
Part Number	kunray
Speed	5800 RPM
UPC	734779299371
Unit Count	1.0 Count
Voltage	72 Volts

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