The Pixel 3 XL has a battery capacity of ~3400 mAh. At 4V, that's ~50 kJ of stored energy. A 100W light bulb consumes that in 500s -- 8 minutes. Does an extra-

The Pixel 3 XL has a battery capacity of ~3400 mAh. At 4V, that's ~50 kJ of stored energy. A 100W light bulb consumes that in 500s -- 8 minutes. Does an extra-bright screen unnecessarily consume power? Most likely. However, one can probably find much-greater efficiency gains by being careful to turn out the lights before leaving home, moving the thermostat closer to outdoor temperatures, or by being careful with hot-water usage.