For others using them do you find charging them to be quirky? I use only JoyeTech chargers that are supposedly the best and have always worked well but with the Spinner 2s I find the green light will come on and the light will go off on the battery looking like it is fully charged. Then I can take it off the charger and put it back on and it will charge for sometimes a couple more hours. It almost seems like the feature that changes the light to indicate the remaining charge in the battery m