so i have loved my mod ever since i bought it about 6 months ago. however i have been having problems with it recently. i charged my batteries overnight and then put them in my mod and it is unresponsive. so i went to a nearby vape store and got a new set of batteries because i was desperate and in a rush. the new batteries work fine but the other set does not. i went back to the vape store for asistance and the guy put the batteries that do not work into his mod and they worked fine and the mod started up immediately. i really can not afford a new mod or to keep buying batteries. please help!!