I cut off the ends of the copper tubes for the heatsink I posted (the clips broke when I tried to reseat it due to horrible temps and I bought another heatsink) and there was no liquid in the tubes (probably would explain why it sucked so much).

The vast majority of heat pipes for low temperature applications use some combination of ammonia (213–373 K), alcohol (methanol (283–403 K) or ethanol (273–403 K)) or water (303–473 K) as working fluid. Since the heat pipe contains a vacuum, the working fluid will boil and hence take up latent heat at well below its boiling point at atmospheric pressure. Water, for instance, will boil at just above 273 K (0 centigrade) and so can start to effectively transfer latent heat at this low temperature.

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By limiting the quantity of working fluid in a heat pipe, inherent safety is obtained. Water expands 1600 times when it vapourizes. In a water containing heat pipe if the water is limited to a 1600th of the volume of the heat pipe, the pressure within the pipe up to 100 C is limited to one atmosphere. Calculations can be made to ensure that the pressure is within the limits of the pipe strength at the highest possible working temperature of the device.

Because there are no moving parts, there is no maintenance and nothing to break. Some are concerned about the possibility of the fluid leaking from the heat pipe into the electronics. The amount of fluid in a heat pipe of this diameter is less than 1cc. In a properly designed heat pipe, the water is totally contained within the capillary wick structure and is at less than 1 atmosphere of pressure. If the integrity of the heat pipe vessel were ever compromised, air would leak into the heat pipe instead of the water leaking out. Then the fluid would slowly vaporize as it reaches its atmospheric boiling point

did he just say the battery can power the mac book for a full "19 minuets"