I have an older set of Dogtra electronics that I use on my wingers. I have misplaced the charger. I also have a couple of Dogtra bark collars. The connection ends on the chargers for the bark collars fit the the transmitter and receivers as well. Will it hurt to use the bark collar chargers until I find the correct charger? Afraid that I may never find the original charger so may eventually have to purchase one.