Mega powerbank DIY with flashlight

🔋 The Ultimate 100W Modular 18650 Powerbank by LeoSpacelabWelcome to the Mega Powerbank! This is a fully modular, 3D-printable, and expandable battery pack designed to fit your needs. The core idea is a modular system where you can add or remove series of 18650 batteries, allowing you to easily replace or customize every single cell.In the standard configuration (4 series of 4 batteries), using 3500mAh cells, this power bank reaches a massive capacity of about 200Wh! Thanks to the 100W output,