Just messed with the PM136 on the bench. Hooked it up to a variable power supply. Not sure how it works when encased in the blower housing ... but jeez, on the bench I can't imagine it being much more powerful without being scary
Ran it at 12v, was drawing about 5.5 amps, so about 66 watts. Running at that rate it could probably use a tad of balancing. Might pull the fan off and see how hard it is to balance.