I’ve used these in several lights and so far not had a problem. One is currently in a HD2010, JM05 both running 2 x 26650 and the other is in this light running 4 x 26650. This light also has one at the moment running 3 x 26650. Some people do have an issue with the slow mode change though. it takes around half a second to change modes. Good luck on your search and I will be reading this thread with interest.