Ufobox's pressure-contact 18650 fused connections | Endless Sphere DIY EV Forum
Amazon.com: 18650 to 21700 Battery Adapter, Converter Adapter for 21700 Flashlight Cases with Metal Contacts 18650 Sleeve Batteries Protective 21700 Battery Adaptor Holder Accessories (2 Battery Converters) : Electronics
Reprinted the giant battery pack for my xbox controller using an awesome looking translucent filament. Also used 18650 battery contacts for the case this time. : r/functionalprint
Free 3D file 18650 Battery Terminal Tip Saver 🔋・Design to download and 3D print・Cults