AS far as the E-Scooter is concerned, I got this communication from another site I'm a member at......
"Hi Scott, a 36V 1000W motor requires a minimum battery size of 15Ah which are 6" long x 3-7/8" wide x 3-3/4" high. Three 12V 15Ah batteries would be needed to make the 36V battery pack and only two 15Ah batteries could fit in a 4" x 12-1/2" battery compartment so one of the batteries would have to go on top of the footplate or somewhere else.
A 36V 750W motor requires a minimum battery size of 10Ah (5-7/8" long x 2-1/2" wide x 4-5/16" high), and a 36V 500W motor requires a minimum battery size of 8Ah (6" long x 2-1/2" wide x 3-3/4" high). Even with an 8Ah or 10Ah battery pack only two of the batteries would fit in the 4" x 12-1/2" battery compartment so one of them would have to go somewhere else.
That scooter must have had a single 36V battery in it when it was new which is the reason that three 12V batteries (larger than 5Ah) are not fitting in the battery tray.
Three 5Ah batteries would fit in the battery tray, however, 5Ah batteries are only suitable for 350W and smaller motors.
The MOT-361000B 36V 1000W motor would work, however, it is longer than the original 350W motor so a hole would need to be cut in the plastic body of the scooter for the back of it to stick through. It would probably stick out of the body only an inch or two.
You could also use a 36V 500W or 36V 750W motor which would still have a lot of power and provide good speed but would draw less power from the batteries so the range would be longer. The 36V 500W and 36V 750W motors are an inch narrower than the 36V 1000W motor so they would stick out of the scooter's body less than the 1000W motor would.
When a more powerful motor is installed then a more powerful controller will need to be installed along with it. The controller should be the same Watts as the motor or a little higher if one with the same Watts is not available.
Our controllers have wiring pinout directions so you will know what parts to attach to what wires on the controller. You will just track the wires to their parts so you know where the wires go on the scooter. A few of the connectors may not be the same in which case new connectors that we sell could be installed on the wires or the wires could be cut and spliced.
Here is an example of our controller wiring directions so you can see what they look like to get a feel for how to connect a controller to the scooter:
https://electricscooterparts.com/hookup/SPD-361000B.htm
If any of the wire connectors on the scooter need to be changed we sell matching connectors for the controller on this page:
https://electricscooterparts.com/whitewiringconnectors.html
You may want to consider installing a 24 Volt motor and controller because then the battery pack could consist of two 12V 15Ah batteries which would fit in the battery tray. We have a 24 Volt 500 Watt motor with a mounting base which is our item # MOT-24500X2500B. This motor could provide speeds of up to 20 MPH on flat ground.
Please let us know if you have any questions."