Travel Distance 2008 Ruff n Tuff 4 WD Hunter

I have a 4 WD 09 Electric Hunter the gel batteries have been replaced with 6 Deep Cycle 8 volt Acid Batteties. I am curious how far others are able to travel on a full charge. I can get a couple miles until I start to creep along. I have noticed that my Brakes drag a little not sure if that is the problem. Maybe I need to change back to the gel batteries. Thanks for all replies.