A friend asked me to find him 4 LiFePO R123 (3v) and a nano charger for cheap, where is the best deal? He'll be using them in a SL Super Tac.
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I'd be tempted to run it on a protected 17670 LiCo instead to get better runtime, LiFePO4s are really going to stink in the runtime department (might give 30 minutes give or take). A 17670 should go well over an hour, but won't have regulated output through the discharge...
I did some searching around and can't dig up anything confirming whether it can handle the voltage from a pair of 3.7V cells... wish I had the answer to that as a pair of protected LiCo RCR123s would give about double the runtime compared to LiFePO4 clels.
jzmtl has or had a Super Tac.They will tell you only to use CR123 primary cells as any other cell could damage the flashlight and void the warranty.