Smpl mod batteries

Hey guys just wondering if anyone owns a smpl mod? Just Ordered one smpl mod v2 with 3 derringer rdas off fast tech.
Been reading about how sum 18650 batteries won't fit? What time of batteries are people using for there smpl mod and where did you order from? Also pix of your smpl mod would be great!

 

I dont own one but, Id be using flat tops with it so that the switch screws in to be slightly recessed, allowing you to place the mod down on its end without risk of firing the switch.

 

Vtc's and he2 and 4's fitted on mine. But I got the.comthentic one but I guess it won't be any different.

 

Where's a good place to order from?

 

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All batteries I have fit on it. He2,he4,25r. Even nipple tops work but switch sticks out