good evening everyone I want to start my first battery. I recovered 3000 used batteries, and I bought 3 opus bct3100 chargers. So I want advice to guide me in testing cells with the opus bct3100 charger. What do I need to know about the cells, when they are good or bad, if there is a special configuration for the opus bct3100 charger. any help and advice to help me sort out the correct batteries is welcome thank .you