I just re-celled an original Quantum 1 battery myself and it seems to work, hooked it up to a Vivitar 285HV and it fires.
However, none of the green battery LEDs (1/3, 2/3, 1) ever lit up. According to the manual, they are supposed to light up to show you current battery status after you fire the flash.
Is this just a case of the cells needing to be fully charged or is something wrong with the pack? The pack is currently charging and the voltage was sitting around 6.2V before I hooked it up.