Beware this is not 3.7v
I bought this battery to use in a fenix ld12 as I read using a 14500 would boost the highest setting from 150 lumens to 320. It was only after I Received and opened The battery I noticed it is only 1.5 v so does not offer any benefit over a standard rechargeable AA., In fact most rechargeable AAs offer a higher mAh.. I even emailed fenix and asked them if this battery offered any benefit over an AA battery Performance wise and they confirmed I was correct and would not increase performance in any way. So if you are after 14500 3.7 volts do not by this. If not just buy a pack of enloop pros.