OK so I've been using my original Joye 510 kit's 2 batt's for about a month. I ordered 3 extra batts after maybe 2 weeks?? Now I seem to have one or two batts that won't hold a charge. BUT it's not consistent. Seems like sometimes they DO charge on the PCC?! I've noticed that on certain batt's, that when I screw them into the wall charger, the light turns red, but if I screw them in all the way it turns green and they don't charge. Seems like some DO charge if I only screw in till I get a red light-I need to mark and log all the batt's to be 100% sure. I'm a klutz and I've dropped the charger on the floor (hard) a few times... Maybe it's the CHARGER that's not working?! I know 510 batteries have a limited life expectancy but what about the chargers?