I have been wanting a REO for a couple of months now and finally have the money to get one but after reading through these threads I'm not 100% sure. At first I wanted a VV model, but I'm not a fan of 18350 batteries, a mechanical Grand is fine, I just like having the VV option. The Grand takes an 18650, which I prefer, but with a button top. I have about a dozen Panny's and Efest flat tops. Will these work or do I need to get a stock of AW IMR button tops? I use a fuse in all my mech's and have a few holocron shortstops. Will a flat top panasonic with the shortstop as a filler work? The battery and fuse questions are my only concerns from stopping me from putting my order in. I could wait a few more weeks to get the means to get the recommended batteries but would like to know what options I have. Thanks for all the info in this section, it answers all my other questions and all the questions I never even considered.