I just completed a runtime test on my haiku xpg. All I can say is that I used AW's black top cells and manage to get 38, 42 and lastly 47mins on the high setting. I had a fan on during the test but not aimed straight to the haiku but to get ample air in the room. All three tests concluded with the batts went into the protection mode. At first I thought it went to protection due to heat issues, but with close inspection revealed that the heat went mostly to the head area, the battery tube had a slight temperature increase. i would estimate around 15% to the batt tube and 85% concentrated on the head. The fins on the head really does work in dissipation of heat not unlike the mule PD. At the 40 min mark, I can actually fully close my palm around the haiku without having any discomfort.
Having just 3 McGizmo to compare, the Haiku dissipates heat much better than the PD-S and Mule PD.