pro-light phaser lites pl 15-any info?

any info about these?
got one at the dayton hamvention for a few $
but it is missing the battery pack.how many/what size cells?
this is an orange plastic c cell light approx 14 in long.slides into a charger sleeve that makes contact with screws above and below the switch.manufacturers site has no info.

I picked one of those PL-20's a while back in someones basement and it works fine with your typical Mag or Streamlight 6V NiCad recaargeable. i believe the replacement bulb is the old school Streamlight SL-15 (remember those). You can also drop 4 C alkaline's or rechargable C's and it works fine also if its the aluminum model with a slight tail cap spring modification. But if its the ABS plastic C's wont work because the spring wont allow you to screw the tail cap back on and you dont want to modify the spring or change it due to the need for the spring to ground against the thin metal strip along the inner wall of the light body.