i have a xxx-s and i getting into driving it gain since it was so gd hot in az, but now that i am into in again, i think my batt may have rested too long, and seems to not have as good of charger and power mostly, and its a matched. But i have been trying to get the power back, and tonite when i drove it it seems liek the power would come and go, like my rpms were being limited but then rev up.....and this is an electric......so is it the battery or is the motor, needing cleaning and cut??? any ideas??? plz help, thanks

Brad