A very good electronics tinkerer / hobbyist.
DIY LiFePO₄ Battery Pack - 4S 3P - 12.8V 18Ah (Low Cost)
Workbench Instrument Cluster ( a Dream Come True Project)
Hunting for Fake Lithium Ion Batteries
Make Yourself a Portable Power Station for Outdoor Camping (5Ah)
Ultrasonic Water Level Indicator
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