⚡ DIY Rechargeable 9V Battery – Never Buy Disposable Again! In this quick tutorial, I hack a dead 9V battery into a USB-rechargeable power source using a Li-ion cell and a charging module. Perfect for saving money and reducing waste! 🔧 How it Works: ✔️ Empty a 9V battery case ✔️ Install a 3.7V Li-ion + charging board ✔️ Test & reuse like a pro! ♻️ Eco-Friendly & Budget-Friendly! No more throwing away batteries—just recharge and reuse. ⚠️ Warning: Li-ion batteries require careful handling. Don’t try this without proper knowledge! 👍 Like, Subscribe, and Hit the Bell for more DIY tech hacks! Full video: https://youtu.be/vyJ_B6rpgqU #DIYEelectronics #BatteryHack #Upcycling #TechTips