The old P-series battery has a smaller mounting slots than the newer InfoLithium H-series ActiForce (shorter charge time, last longer, but same voltage, current?), supposedly the charger would work on both, and older p-series camera can take both, but newer camera cannot take the older P-series?
photo of p-series battery
photo of p-series camcorder
photo of h-series battery
photo of h-series camcorder