Wpl C24 18650 2s Battery Pack

thingiverse

You won't need to drill an extra hole or cut anything. Simply use one longer screw, approximately 20 mm in length, or a smaller screw with a washer. For charging, you'll want to utilize a 2S battery charger, which can be found here: https://tr.aliexpress.com/item/2-S-5A-Li-Ion-Lityum-Pil-7-4-v-8-4-V-18650-arj-li/32838043197.html?spm=a2g0s.9042311.0.0.3da24c4dxCqqL For the 18650 cells, you can repurpose an old laptop battery. You'll also need six screws with a diameter of 10 mm and a thread pitch of 2 mm, likely equivalent to M2 for plastic.