I can’t tell where you are from, but sometimes voltage amounts are different in different countries. Maybe that might be your problem? Also, try cleaning both the contacts in the battery and those on the charger. Press on all three of those little knobby things where the battery touches and make sure they all are springing up straight. Oh and if there’s a contact point in the center of the charger where the nub from the battery rests. Maybe that thing isn’t clean or isn’t springing up properly. Sorry. LOL! I’ve never taken a serious look at that spot before so I don’t know if that could have anything to do with it. Hopefully you’ll find the answer to this mystery soon.