How can I fix my Electric Mobility Scooter, which tends to lose drive?

there could be two problems here,

First check the speed pot, when it stops try pressing the throttle lever in the upwards direction as you push forward, if it responds then your scooter requires a new speed pot.

Check the brushes on the motor, make sure they can move inside, if they are jammed this will cause the problems you mentioned, check the battery connection are clean and tight.
Regards

gewizrepairs.co.uk
December 2009

it sounds like the brushs in the motor try removing them and cleaning them with a wire brush and contact spray there is a black pod under the motor remove and you should see the brushs

dave
June 2007