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I just wanted to add one more piece of data on the battery life. While testing dark mode, I recorded battery use just like I did earlier. The results were almost identical (including the shape of that battery usage curve). It took a total of 8 hours and 14 minutes to drain the battery (two minutes longer than the previous time):
Hour 1: 100% to 93% = 7% battery use
Hour 2: 93% to 79% = 14% battery use
Hour 3: 79% to 63% = 16% battery use
Hour 4: 63% to 48% = 15% battery use
Hour 5: 47% to 26% = 21% battery use
Hour 6: 26% to 17% = 9% battery use
Hour 7: 17% to 11% = 6% battery use
Hour 8: 10% to 1% = 9% battery use (and then 14 more minutes for that last percent of the battery to go and the Sage power itself down).
Initially, I was surprised that dark mode would use as much energy as light mode. But, then I realized this is an E-Ink screen, not an OLED. So, the energy use would be coming from the screen lighting (or other things -- all of which remained constant) and not the production of white/dark areas of the screen (text/background).
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