Mod making question. Hi all. Can anyone help? I have been making my own mods for a while now and recently decided to add usb charging to an old 18650 parallel box. I have noticed that if I leave the atty screwed into the 510 while charging it fires with the charging current of 1a. I have used an n channel mosfet. Do I need to use a p channel or fit a diode somewhere in the circuit? Any help welcome.