You can use any Qi wireless charger, just as long as you position EMO’s left foot over the centre of the charging area. The skateboard is rated at 5 watts, but I have used 10 watt wireless Qi chargers with no problem. I actually made my own chargers just for fun. I still think the problem is with charging at this stage, whether it is a problem with the EMO leg charger or the skateboard I don’t know.