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🔋 Auto Cut-Off 3.7V Lithium Battery Charger | Smart DIY Circuit with TL431 & BD139

Automatic 3.7V Li-ion Battery Charger

Stop Overcharging! Build Auto Cut-Off 3.7V Charger Using TL431 & BD139

Smart Battery Charger Project | Auto Cut-Off 3.7V Lithium Charger Explained

Make a Safe 3.7V Lithium Battery Charger | Auto Cut-Off DIY Electronics

Welcome to my channel!
In today’s video, I’ll show you how to make an Auto Cut-Off 3.7V Lithium Battery Charger using TL431 and BD139 transistor.
This smart circuit automatically stops charging when your battery is full — simple, safe, and perfect for 18650 Li-ion batteries.
This circuit automatically disconnects the battery when fully charged, preventing overcharging and increasing battery life.
Watch till the end to understand the working, connection details, and testing results.
📘 Components Used:

BD139 Transistor

TL431 IC

LED

680Ω, 1KΩ, 56Ω resistors

3.7V Li-ion Battery

⚠️ WARNING
This video is for educational and demonstration purposes only. Handle components safely and at your own risk.

Disclaimer

Video is for education use only Copyright Disclaimer under 107
of the Copyright Act 1976, allowance is made for fair use for purpose such as criticim, comment, news reposting, teaching, scholarship and research.

fair use is a use permitted by copyright status that might otherwise be in fringing. non-profit, educational or personal use tips be balance in favour of fair use.

Shakti Tech Shakti

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