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Updated the post. I still don't know which resistors and PnP transistor I should use, nor if my calculations are right. Thanks for the answers.

Yup, removed the links and references to other shops. Didn't mean to be disrespectful, and of course some of this build's pieces are from here, such as the body, blade and switch. Still, even if I...

Wellp, hello there!

This will be my first build, so I have some questions:

I'll be using:
-A basic 3.7V Li-ion battery with PBC (3,6V-4,2V, Capacity 3400Mah, Output: 4,2V 600mA, Input:...