Why does my electric wheel chair go in circles?

Question

it just started happening the batteries are brand new

Answer 1

Could also be your hand controller is not working properly. You didnt say if you could move forward and backwards.If only in circles try bobs advice ,if that fails check out your hand control.

Answer 2

Is only one wheel driving and the other not moving at all?

Two possibilities come to mind:

1) Mechanical binding in one wheel (the one toward which you're turning)

2) Electronic control problem causing the wheels to be driven differently