are you sure? Normally the tm06 drains the batteries equally during use. Only in Standby it drains two batteries more than the other pair.
I'm very sure. The batteries were freshly charged and checked for voltage just before beginning the test.
I offered a member that I would use my laser thermometer to check the exterior temperature of the TM06, what temperature the light stepped down at and how long it ran at various levels before the thermal step down. The light ran for close to 40 minutes on turbo, high and the next step.
I ran the same tests using the Vinh modified light and the voltage between the cells were within .05 volts in each pair. The Vinh light with more power also ran longer before thermal step down due to the additional heat sinks.
I measured the temperature of the light in four places on the circumference. The coolest location was just forward of the side switch. I checked locations 90 degrees apart and a inch back from the bezel. The head body was almost 10F hotter than the switch location. The switch must have enough mass to resist the temperature flux.
I don't like the power indicator light flashing when the light is turned off. You can push the side switch after the tail switch is turned off and the indicator light won't flash anymore. For me having quite a few lights I use a different light just about every night for my evening walks. A light may sit for a couple of weeks before its turn for the walk. Much easier to loosen the tail cap and not have any voltage drain.
I had a Nitecore TM15 get switched on in my coat pocket. I couldn't have been more than 90 minutes because I was making my biweekly trip deliver some parts and get my next drawing package. The light got hot enough to partially melt the holster. That cured me of relying on the switch to isolate power from a light.