the only problem with cr123 is most of my expedition is in rural part of Borneo.. Finding a CR123 is like finding a needle in a football field (actually harder) :mecry:. I cannot bring rechargeable because there is no electricity, and bringing a lot of cr123 would take too much space and not practical.. so if RA if you read this.. please make an AA version because its a lot easier to share the same battery with other equip.. the trick is to use fresh battery on flashlight, dry weak battery in sun can be use for GPS, lastly hit the battery with rock and make a circular dent and can be use for radio.. incase you are wondering, yes i'm seriuos..