Zone Electric has no torque

[ccowart1]

I'm having a torque problem with my 2010 Zone Electric Car. About 8 months ago I noticed a drastic change to my uphill speed and the batteries were not lasting long at all. I replaced all the batteries but still continued to have uphill speed and power issues that have progressively gotten worse. The new batteries completely discharged about 2 months ago and after recharging individually and getting the car to turn on again I have no torque at all. The car will barely get up a hill with the slightest incline. It performs pretty well on flat ground and will top out as normal on down hill grades. Any ideas? Thanks in advance.