This project is iterating on last year's design of a simple (and mostly-safe) battery badge which back/forward-powers any electronic badge & add-on via VCC pins, supplying ~700mA of current @ 3.3V while keeping track of how much power is drawn via back-powering and forward powering other badges and SAOs. This badge runs off of it's own power, and is able to operate as a standalone unit. To view power usage statistics users connect to the Captive ArcadeTM on the ESP32 to view local battery power consumption and discharge stats.
See https://BatteryInter.ent for more details.