It will run off of 4 batteries but they have to be put in the battery cage in the right order to work. You have to have two of them going one direction and two of them going the other direction. You can't put two of them on one side of the cage and two on the other side. They have to be placed in slots that are next to each other. You will see what I mean when you try it.
It works just fine but battery life is just cut in half. Brightness seems to be exactly the same.
I'm really wanting to try a TK35 first. But I just got done buying a Dereelight DBS V3 XR-E R2 aspehrical because someone directly above my post here told me I need one. LOL! Thanks Rick. Ole buddy ole pal! We are going to have to get together and have a light nite! Heck I may even buy us some other lites but those you drink instead of shine.
I just bought the TK35 just a few minutes ago. I just got an email from Shane with a tracking # that my package is on its way. Now this is why I like dealing with Shane. You just can't find a better seller who will do you any better. Thanks Shane! We will do it again soon.