There’s “ultra power saving mode,” which turns the [Samsung Galaxy] Note 4 grayscale and turns off everything but texting, phone calls, and manually refreshed email. It turns your ultra-modern phone into a pretty cool Treo circa 2006, but it turns 10 percent battery into hours and hours of life.
That’s both hilarious and absolutely awesome. I couldn’t find a good explanation online of why turning the display to grayscale makes it use less power, but it looks like that’s probably an AMOLED specificity which wouldn’t apply to iPhone anyway.
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