Rader, thanks. This is the kind of data I need. I own a dewalt 20v drill with a 5ah battery so, if the process takes 5 minutes, I might be able to do a half dozen hives per battery/charge.>> use a battery operated tool as a platform and ...
Keep in mind that a typical commercial vaporizer (and many of the homemade ones using glow plugs) are approximately 150 watts. At 12 volts that is about 13 amps. At 18 volts that is 8.4 amps. Your tool battery will need to be capable of delivering that load for the length your heater "on" time. That may be a challenge for a typical tool battery.
More data: I'm also looking at something called a PTC heating element that shuts itself off at a specific temperature by resistance. If I could mount a cup to that...