Hi, guys! I finally finished building this UPS. It has 2 outputs of 12V and 19V and a big capacity, even bigger with better li-ion cells. A lot of you asked me to make it and because you are my favorite subscribers :) here you go! This is a big project with a lot of details, so I divided it into 2 videos. Feel free to visit to order professional PCBs at low prices for your projects. $2 - 2Layers 5pcs; 4&6Layers starting at $5. A big THANK YOU to all my patrons, especially to: Richard Fjellvang, David, Max Rice, Razvan Alexandru, Jacek, techge, Anthony Ortenzi. If you are a nice lad and want to donate to me on Paypal, here you go: melcumlk@ My Patreon campaign: My Facebook page: My Instagram: Full schematic: List of components: Project box 200*120*75mm: HG2 18650 3000mAh cells: 18650 cells holders: 4S battery indicator: 4S BMS with balance: Switch 4 pin: 12V relay: Heatsink 20x14x11mm: Mini360 buck converter: Fuse holders: 1N5404 diodes: 2200uF 25V capacitors: XL4015 buck converter: XL4015 CC/CV charger: 150W boost converter: jack (male, 22AWG): female connector: jack: female connector: M3 standoffs 300pcs: If you enjoy my videos, hit the Subscribe button!