Useful for testing unknown batteries, or as an external pack monitor

Bill of materials:

• GWUNW OLED Parameter tester (100V, 10A): https://www.aliexpress.com/item/32844522748.html
• XL7015 high voltage module (square-type, green PCB): https://www.aliexpress.com/wholesale?catId=0&origin=y&SearchText=XL7015+
• 26AWG wires, color coded
• Optional enclosure 64x58x35mm (Gainta G302 or equivalent)