I have 2 new batteries and 2 old pcc's. When I'm trying to charge the batteries off the pcc's the behave differently than my old batts. They seem to charge forever, the charge indicator never turns off and after a while on the pcc the tip starts to blink several times periodically. is the tip blinking telling me that the battery is full? Are these two compatible with one another, or are there new pcc's that can handle these batteries?