better than the hellish batteries that leaked in my car reader. I've never had any problems with Energizer. Work pretty well for me. If I can trust anything, only these batteries and charger seem to be good. gotta give him more time. This is a real experience, code reader, I had to order a new one. Old devices for 200-300 dollars. With dura mater. Never had such a problem with an electric fence energiser.