How to Reset the PMU on a PowerBook G4 15" A1095 5, 4 laptop?

I have been refurbishing 3 PowerBook G4 15" A1095s and 1 PowerBook G4 15" A1106 and need help with battery issues. All of them have been able to charge a battery. I have attempted to and rebuilt 1 A1078 battery with excellent results and have failed on another. I have learned how to reset the Pram but do not know how to reset the PMU or if that will even make a difference. Also I am wondering if removing the Pram battery has an effect on the charging system as I have one time experienced the single flashing green light on an A1078 battery and managed to get it to charge by putting it in a G4 A1095 that I had just reassembled and had previously removed the pram battery. I need to know this because the A1078 battery rebuild I failed on will not charge on 2 machines that will charge other batteries. I have an A1148 battery that I rebuilt that has never charged beyond 88% and now has dropped to 66%. I assume that I either used some bad cells or damaged the controller within the battery. Any useful information will help.