🔋3.7v Smart Battery Charger 25W | Auto Cut-Off ⚡ Full Indicator 💡

🔋 Build a simple 3.7V Li-Ion battery charger circuit using MJE13005 and TL431. This DIY USB charger circuit is designed for charging 3.7V rechargeable batteries using a USB power source. The circuit includes voltage regulation and charging control components for a simple electronics project.

⚡ Components: MJE13005, TL431, resistors, LEDs, 3.7V Li-Ion batteries and USB power input.

⚠️ Safety: Li-Ion batteries can be dangerous if overcharged. Use suitable protection and verify the charging voltage/current before connecting a battery.

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