Mega powerbank DIY with flashlight

🔋 The Ultimate 100W Modular 18650 Powerbank by LeoSpacelab

Welcome 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, you can easily charge laptops, drones, smartphones, and camera gear.

Plus, it features an optional Flashlight Module that can stay on for weeks!

Boost Me

take a look at my minipowerbank collection https://makerworld.com/collections/21153900 

⚠️ SAFETY DISCLAIMER
This project is not for beginners. You need basic soldering skills. Always triple-check your wiring and pay close attention to battery polarity. Handling lithium batteries and high-power electronics incorrectly can be extremely dangerous. Build at your own risk!

🛠️ BOM - MATERIALS AND ELECTRONIC COMPONENTS 🛠️
Here is everything you need to build the powerbank:

⚡ Basic Electronics:

• High-power charging module (100W) Lithium version: https://it.aliexpress.com/item/1005010503311631.html 
• BMS 4S 40A Board (for 4 series of batteries): https://it.aliexpress.com/item/1005008057252957.html 
• Dual 18650 battery holders (8 needed for the 4-module config): https://it.aliexpress.com/item/1005008870018574.html 
• 18650 Batteries (3500mAh recommended)

🔩 Hardware and Cables:

• M3x5x4 Heat set inserts (Nut embedded) 52 pz: https://it.aliexpress.com/item/1005008318533389.html 
• Countersunk M3 Screws:
  • M3x6 - 3 pcs
  • M3x8 - 40 pcs
  • M3x12 - 9 pcs
• 22 AWG Silicone cables: https://it.aliexpress.com/item/1005006350734418.html 

🔦 For the Flashlight Module (Optional):

• 3V LED Panels (or max 14V):
  1- https://it.aliexpress.com/item/1005011551277190.html 
  2- https://it.aliexpress.com/item/1005005920507948.html 
• 12mm ON/OFF Switch: https://it.aliexpress.com/item/1005007172624075.html 
• Step-Down Module:
  1- https://it.aliexpress.com/item/1005007508685885.html 
  2- https://it.aliexpress.com/item/1005011741522181.html