I charge the 510's with the battery that came with it. Only been vaping a few months. I know 2 of my original batteries are shot but the last one's I bought just a month ago. I put them in the charge and when the green light goes on, I take it out although I'm not checking all the time. Some I've kept in much longer than when the light turns green if I'm away, etc. I know I vape all day long but seems funny 3 (one new) seems to just go at once (not completely dead, just don't last longer than 15, 20 min.) I am using my new charger I got from Joe but don't see much difference.