How to Build a 4S Li Ion Battery Pack | Molicel P30B DIY Tutorial

How to Build a 4S Li Ion Battery Pack | Molicel P30B DIY Tutorial In this video I'll show you how to build a high-quality 4S Li-Ion battery pack using Molicel P30B 18650 cells. In this step-by-step tutorial, I'll show you the complete process from spot welding to final testing. Support me on Patreon:   / u17351593   STL Files: https://drive.google.com/drive/folder... We'll go through every step of the process, including: ✔ Checking the cell voltages ✔ Planning the series connection ✔ Spot welding the nickel strips ✔ Installing the balance connector ✔ Soldering the XT30 connector ✔ Testing every cell ✔ Wrapping and finishing the battery pack Whether you're building a battery for an FPV drone, RC airplane, robotics project, or any other DIY electronics project, this guide will help you build it safely and correctly. ⚠️ Important: Lithium-ion cells can be dangerous if handled incorrectly. Always use a proper spot welder, verify the polarity before making connections, and double-check all voltages before charging. Battery used: • 4 × Molicel P30B 18650 cells If you enjoyed this video, don't forget to like, subscribe, and leave a comment with your questions or suggestions for future projects! Thanks for watching!