Re: NVG BATTERIES - ever had a problem?
I too have used the Lithium batt powered goggs in all temps and environments. The only difference which could make a lot of difference is L batts don't fade to nothing like AA's would, they get to a certain charge level then drop out completely. So you go from having a perfectly good tube to a completely dead one. The FJ boys replace them every trip for this very reason. In the trucky world we tend not to (although the squippers say we should), as it is less of a drama. Both tubes on both stick monkeys goggs (which get the batts replaced at different times by the way) all dropping out at the same time, would be very bad luck.
The other note of caution is Lithium batts are no barrel of laughs if they get wet inside and are DAC like you would not believe.
And finally. A big consideration if you are choosing which battery, is how you will get rid of the dead batts when they are finished? I seem to recall that if you intend of disposing more than 50 grams of Li Batts in a year you have to have all sorts of licences and pay a fortune to some recycling plant.