On Thu, 23 Feb 2017 08:44:26 -0800, Jeff Liebermann
wrote:
If your smartphone as a battery usage graph, like all Android phones,
you'll find that it also has a list of which applications are sucking
the most power. The backlighting for the OLED screen is invariably
the highest.

No brain function before my morning tea. That's wrong. There is no
backlighting in an OLED display. That should be the LED "screen"
power consumption, not backlighting power consumption.
https://www.howtogeek.com/244748/how-to-see-which-apps-are-draining-your-battery-on-an-android-phone-or-tablet/

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Jeff Liebermann
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