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LEDs use less energy, but I'll be you've been experimenting a lot with the new light or pocket carrying it with locking out the tailcapf (accidental undetected activations.
Surefire batteries are good, but I too went to the cheaper by the 50 packs from various online battery and flashlight retailers. So far the Tenergy (Chinese) have be faultless at a dollar or less delivered. Sadly the rechargables don't seem to work in SF's but do in the Fenix flashlights, saving me even more for a work light; though I wouldn't trust a Fenix for critical work like I do my SFs; old bias I suppose. I carry duplicates of everything I consider critical gear, not just spare batteries.
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