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Betty,
If they were Surefire batteries, I have heard, hence this is hearsay, that there are some problems with Surefire batteries. I don't recall what the specific problem(s) was. And in all fairness, Surefire may have corrected the problem by now.
My students and I have performed a number of intensity/run down tests and run probably a hundred or so Sanyo CR123 batteries completely down and have had no problems.
I know Surefire batteries are cheap, about $1.25 each, but you can order Sanyos from Botach for $1.00 each.
Further, for what its worth, from what I've seen from all the testing we've done, Surefire lights pales (no pun intended) in comparison to comparable Streamlight lights, e.g I just finished a test on the Surefire M3 I just had to have, some $230! It's output was about 1000 foot candles less than the Streamlight TL3! They both use three CR123 batteries. From Botach, the TL3 costs $59.00. It's much smaller than the UltraStinger and produces just about the same intensity for the same length of time.
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