24V Motor Brushed Controller Box Speed Controller for Electric Bicycle Scooter E-Bike (350W)

these controllers are pretty good for the money however ... we are in the process of sorting through an issue that is happening on 2 scooters. we bought a 24 volt version here and a 36 volt unit from the same OEM from another vendor. they both have a voltage cut off to prevent high current from burning out the unit ... the 24 volt cuts out at about 21 and the 36 colt cuts out at 31. we have handles on both units that reflect the voltage from the controller, there is a wire for this. Mom and daughter drive these to school every day, they are both razor pocket mod scooters. moms was upgraded to 36 volts as this is acceptable for the motor in the unit ( My 1020 ) within about a week of each other, first the 36 volt unit would all the sudden go from 35.8 to 31.9 and the scooter would drag... this would happen always after having the throttle at full , backing off for a second and then bomb the power would drop ... since I am the engineer ... i tested everything and could only find a dissimilar charge rate on the batteries so we charged fully each one and bought a battery tester to confirm resistance and CCA for the SLA batteries... the scooter would go further but still do the same drop off ... then magically my daughters 24 v started to do the same thing. these were all new batteries as of march 2019 so i did the whole testing thing again .. and even bought a charge balancer for SLA batteries here on amazon. finally after disassembling both motors to find them pristine we could find no other cause then the controllers had changed behaviour ... we even bought a 3rd scooter pocket mod ... and it was faster with used batteries then the 24 scooter with the variable controller. we asked the vendors after explaining our situations ... what they thought ... and both have agreed to send us new controllers. we will report back after this ... in the mean time we also bought a programmable controller not available on amazon AND a swagtron pro today .. my wife wants me to take all the parts off the swag and put it on the pocket mod ... another project for dad :)

I suggest not buying as there is no schematic in English nor can you find one on line.

Just installed this on my sons MX350 along with a new throttle. Worked fine after a few tweaks. If installing this on the same bike there's a few things you might wanna know. You'll need to reverse the polarity on the motor connector and charge port, you'll also need to source the brake switch connector off the original controller. There are plug and play kits available for triple the price if you're not willing to splice a couple of wires yourself :D . A 25 cent potentiometer wired to the blue throttle wire allows you to govern top speed and also smooths out take off (I used a b100k and wired to pins 1 and 2).

This was to repair a child's scooter. It did not fit. Have been unable to obtain from company that made the scooter.