But if you use your Xenon bulbed flashlight sparingly (hence the word FLASHlight) your batts should last you longer than you think. I change batts in my G2 about every other month and the E2e about every 6 months. Funny...the E2e actually gets more shine time than the G2 does! I guess because the G2 "throws" more than the E2e, it uses more juice.
And a pretty reliable source told me that the Blackhawk Gladius is junk - pure and simple!