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Further update on some testing.. The PowerBoost 500C draws 4mA from the battery in its default state of ON but with no load connected. If I pull the EN pin low, power consumption drops to 13uA. With the TeensyLC and LCD screen powered on, the system draws 75mA when powered via PowerBoost and...

I was thinking of a way to turn off the PowerBoost output from the Teensy, but I'm not sure how I could do that.. The PowerBoost output is enabled by default, with its EN pin by default pulled high. The pin needs to be connect to GND to turn off power. So I would need a way to hold it to GND...

I'm building a relatively simple project that includes a TeensyLC, a Waveshare 1.6" LCD screen (https://www.waveshare.com/wiki/1.69inch_LCD_Module), three buttons, and an ADC (possibly onboard, but likely and ADS1115). For power, I have a 400mA LiPo and I'm using an Adafruit PowerBoost 500+...