Q: What should be noted while installing the battery cells?
A: Please make sure the two cells are installed correctly to form a series circuit, positive to atomizer (hybrid adapter/510 connection), negative to button.
Note: Please be careful not to use batteries with torn castings as it is a safety hazard.

Q: What is the size of the bottom phillips screw?
A: It is M2x6.

Q: What is the size of the top thread?
A: It is M20x0.75.