UPDATE - It's important for this project to use a better 2S BMS board with overcharge recovery voltage feature (link below).
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A big Thank You to my patreons, especially my favorite - Kyle Shankin :)
Schematic: https://i.imgur.com/PgwSa2K.jpg
Components list:
2S BMS with balance: https://s.click.aliexpress.com/e/_c3rTVzHz
plastic box 90x70x28mm: https://s.click.aliexpress.com/e/_c4nzAFhl
XL6009 boost converter: https://s.click.aliexpress.com/e/_c3ECWJAX
DC-005 5.5x2.1mm female connector: https://s.click.aliexpress.com/e/_A9UT4g
Small switch 10x15mm: https://s.click.aliexpress.com/e/_c3zTnXT9
5.5x2.1mm jack (male, 22AWG): https://s.click.aliexpress.com/e/_Dmqj3G5
Small voltmeter: https://s.click.aliexpress.com/e/_c4nKgrwP
Charger 8.4V 2A: https://s.click.aliexpress.com/e/_c4McFRTD
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#diy #ups #18650
