AMKP40 technology (YouTube ).

 3.7v Lithium-ion Battery Charge Level Monitor Circuit Diagram; by "AMKP40 technology" YouTube Channel.  Without IC Narrow Voltage Range 3.7v Lithium-ion Battery (Adjustable) Charge Level Monitor. Battery charge status monitor circuit board.  YouTube Video Link   Like 👍🏻 Share 👌🏻 Comment 💌 SUBSCRIBE ✔️ Follow ✅ Thank you ❤️🙏🏻😊