P3 batteries have different voltage and connector is changed so you can't make a mistake easily.
To be honest I think even $200 would be quite generous unless you can see it working, I assume it's the Vision or Vision Plus?
The camera on it was pretty poor with severe fish eye - all rather frustrating as the ready to go package at the time seemed to have great potential.
Indeed it was good but the P3 was a great deal better in every way.

They were prone to Vortex ring state when descending, and batteries could fall out unless you carefully checked the poorly designed clip was engaged.