Do I need a controler for my scooter keeps losing power to the moter

The motor transaxle gearbox is not designed for low or high speed towing. You may have damaged it. Block up the rear wheels off the ground and check for "no load operation ". If anything sounds bad or runs poorly you can see quickly or hear the damage. All other checks require disassembly or electrical checks which require more expertise.

New Batteries must broken in, For the first 20 Charges, do not allow the power level to go below half way before recharging. Charge the batteries in a warm environment. Also, if charging in a cold environment the batteries won't get the best range. Batteries have 60% of their capacity when the temp. is 32 degree F. At 0 degrees F. the batteries will only have 40% of capacity. Batteries have shrinkage. Good news the capacity best at 80 degrees.
If the brake is hanging up, it will cause drain on the batteries. A sure sign is, if they are hanging up is after 10 min. of running the brake will be very hot to the touch. It sometimes turns the brake blue in color or rusty.
The brake engaging while in freewheel mode is supposed to be a safety, to keep run-a-ways from occurring. I agree with you it is aggravating when you try to push the scooter. Scooter Doctor App

I’m happy to assist further over the phone at https://www.6ya.com/expert/bill_bcbb89783b08c489

hi ,there are two parts to batteries holding power and preforming well, firstly how good are the batteries, secondly how good is the charger ?, good batteries and a bad charger will make the batteries appear bad...

Regards
Rob

www.gewizrepairs.co.uk

The motor relays seem to be giving a lot of people problems for these scooters, these days.

the batteries are worn and problably need replaced , the computer will stop running the scooter at threshold voltage, older batteries and will hit this threshold voltage and slow the scooter

hi, first you need to check the connections to the batteries then to the motor controller, and don't dismiss the speed pot, disconnect the speed pot and try a normal 5K pot inplace of it, if the scooters responds you find the problem just a case of getting the right speed pot. Check the freewheel switch, normally it located on the motor side.

Regards
GeWiz.

i have the same problem with my pride hurricane ,
i am looking into the throttle potentiometer to see if that is the
problem,
i will post on here if i find out,
let me know how you get on !

sounds like the brushes could be worn out,

Connection form the batteries to the motor controller then check the M+ M- leads from the controller to the motor

Could be the controller breaking down

Batteries are okay ? or simply the speed pot is worn,

when it stops , move the throttle lever upwards, does it start to go again, if so a new speed pot is required.

Regards
Gewiz.

Seems like you are on the right track and you can save alot of money there. I would aproach this systematically trace the power to the switch then t0o the speed controller and back to moter you can also put some jumpers from a battery to the moter connections.
If it is in such new condition then it must be a damaged or loose connection.