My two recommendations battery wise are eneloops/duracell LSD NiMH and Energizer e2/Ultimate Lithium AAs. The Ultimate Lithium will have the longest runtimes and are recommended if the light is to be stored for a long time and you want it to be ready for an emergency. The only down side I have seen to running the e2/Ultimate Lithium are the fact that they heat up a lot. When I was running tests of my circuits way back when I was using the components outside of the body and when I grabbed the batteries they were hot to the touch. I don't think it hurts them at all and they are being run within spec but it will add heat to the flashlight body. They would be ideal for winter use as they are good to very low temperatures as well. The eneloops will provide you with less runtime but give you guilt free lumens and they will not add to the heat load.W00T !
I love that variety of comparison pictures. It's always amazing how different lights look in person vs. in photots....so it's interesting to read your observations, including the MC-E.
Thanks for taking your time, persevering through a long list of problems, and having it turn out the way you wanted. Let me know what you have found to be the best battery setups, and voltage range limits. It will be fun to check this out and compare. :thumbsup:
Do NOT use rechargeable lithium. This would put it over the voltage range of the drivers(The voltage max is 9V).