Yeah I ran 10440's in my LOD for a while but I gave it up. They are fun because you get some crazy output but ultimately it's not really worth it. For one, when fully charged, the 10440's are a bit too much for the lod and it makes the light blink on lower modes, although this wears off after a few minutes of use. Also the light both gets very hot on high and has a very short runtime. Lastly, 10440's have no protection, so if you don't recharge them before they get too low, they are gone for good. Eventually both of mine died, the first one because I didn't know how to use them properly and the second because the lod accidentally turned on in my pocket and ran until dead. All that being said they are still fun to amaze or annoy your friends with and if you want them get them from AW in the marketplace.