goolrc b6 mini professional balance charger/discharger for lipo lilon life nicd nimh pb rc battery goolrc warning: the device itself is a product without power.the wrong operation can cause the battery to short circuit and damage the battery.there are two situations that can cause a short circuit. <br>1.two rows of pins are inserted at the same time. <br>2. after the battery is inserted, the contact with the metal material will cause a short circuit.