Quantity   Component name
1 × 0.15x8mm Nickel Strip https://www.amazon.com/gp/product/B08RHP8NDD/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
1 × Panel Mount Barrel Jack https://www.amazon.com/TOTOT-5-5mm-Female-Socket-Electrical/dp/B077YB75N3/ref=sr_1_3?dchild=1&keywords=panel%2Bmount%2Bbarrel%2Bjack&qid=1618780896&sr=8-3&th=1
4 × 18650 Battery Any 18650 battery with good capacity
1 × 2S 8.4v BMS https://www.amazon.com/gp/product/B07KSQY67X/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1