For the battery cap, Sunbox designed them for your thumb to be pressed down on the cap, and spun...no tools, nothing. It works great, try it! Simply press your thumb over the cap, and the "star design cut'outs" grab your meaty thumb and spins right off.

The biggest drawback I would mention is the manual 510, it will need adjusting for different atties....better to find a permanent rta, and "mate" the pair....I broke my first one's 510 by forcing a rta down, but the vendor sent me another...I have green and black, and love mixing and matching front and side panels for a two-tone look.

I recommend if you have lots of 22mm rtas, it's about the same size as a Billet, just a bit thicker.