I just completed a battery swap. Seems that another common problem is that some shoes have bad batteries. The shoe won't charge or turn on at all. I first swapped out the charge port and when that didn't work, I swapped the battery. I found an almost identical battery and an identical charge port on Ebay. The only difference in the battery is that the Ebay one is 1200mah instead of the 1000mah battery that comes with the shoe. If you do this swap, you have to switch the wire plugs, since they are different. The most stressful part of this is cutting open the insole. Since there are wires underneath, you must be VERY CAREFUL not to nick or cut them. I used a very sharp exacto knife. I started cutting on the inside of the shoe (not the swoosh side). When I got to the back of the shoe, I didn't push the knife too far down into the sole since I knew there were wires there. Then I just scored the insole the rest of the way (towards the swoosh side of the shoe). Then you have to pry up the insole. Once the swap is done. you can just lay the insole back down and glue it into place.