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5v power bank with 3.7v li-ion battery
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![Sewing Machine Light v1.0 - Codrey Electronics](https://i2.wp.com/www.codrey.com/wp-content/uploads/2020/04/Power-Bank-Module-Basic-Circuit.png)
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![Homemade 10000mah Power Bank Circuit Diagram](https://i2.wp.com/circuitspedia.com/wp-content/uploads/2018/07/power-bank.jpg)
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