2 pcs Spring Loaded 22mm 510 Battery Connector Solder Lug

JacobsParts Momentary Pushbutton Starter Switch Circular Stainless Steel Metal Silver fits 5/8" (16mm) Diameter Panel Cutout Hole

Hammond 1590G Diecast Aluminum Enclosure -- Inches (3.9" x 2.0" x 0.9") mm (100mm x 50mm x 24mm)

Ulincos Momentary Push Button Switch U16A1 1NO SPST Silver Stainless Steel Shell Suitable for 16mm Mounting Hole

Battery Holder, 18650 x 2, Through Hole

uxcell 20 Pcs DC 50V 0.5A 3 Solder Lug Pin 2 Position SPDT 1P2T Mini Panel Slide Switch