I got lazy/fancy, and skipped traditional switches altogether on my upcoming diy box (4x18650). Essentially, it's 3x18650 in parallel to power the atty, and a 4th battery to power a jet ski starter solenoid I'm using as my switch. It says it's 230A rated
through the primary circuit, so I should be good. 10ga insulated copper wiring where needed, otherwise just ribbons of 1/16" copper plating.
Clank ->

-> Clunk.