🔌Adiós Ácido-Plomo! Convierte tu ventilador recargable a LITIO (Paso a Paso)🔌

*IMPORTANT, DO NOT USE THE INTERNAL CHARGER ANYMORE!!! The video audio is low; please turn on subtitles if you can't hear it well. Cheers! Tired of your rechargeable fan's battery lasting less and less time or failing completely? In this video, we perform an extreme upgrade, removing the heavy, old 6V 4Ah lead-acid battery and replacing it with a modern 18650 lithium system with a Mini-UPS module. Join me in this technical process where we not only improve battery life but also automate the system to function as a true backup during power outages. What you'll see in this video: The Problem: Why lead-acid batteries fail so often and why lithium is the ultimate solution. Stress Testing: Real-time voltage monitoring step by step (from 4.1V to the safety cutoff at 3.2V). Thermal Analysis: How hot does the Mini-UPS module and Schottky diode get under real load? Automation with Relay: Installation of a 5V relay so the fan turns off automatically when power is restored and turns on instantly when the power goes out. Actual Results: We achieved almost 3 hours of continuous runtime with a constant breeze. Materials Used: Original Battery: 6V 4Ah Lead-Acid (Dahua DHB 640). System Brain: 5V 3A Mini-UPS Module. Cells: 2 x 18650 Lithium (2P Configuration). Control: 5V Relay Module with optocoupler. Fan: Standard Solar Fan model.