[Galaxy Note 4 General] gekkehenkie11:
That's exactly why this is the dumbest thread on the forum. Screen on Time in itself is totally pointless to compare. Put your screen time-out at 30 minutes, lower your brightness, don't do anything, just leave your screen on, only tap your screen after 30 minutes for it to stay on. You'll reach over 24 hours screen on Time. So what's the use in comparing that ?

---------- Post added at 03:29 AM ---------- Previous post was at 03:03 AM ----------

Anyway I was reading a bit in this thread and luckily it's not limited to the useless 'screen on time' comparisons. So here are my 2 cents on Android battery usage. This is the data as measured and supplied by Samsung for the 910F:

<?xml version="1.0" encoding="utf-8"?>
<device name="Android">
<item name="none">0</item>
<item name="screen.on">76</item>
<item name="screen.full">223</item>
<item name="bluetooth.active">101</item>
<item name="bluetooth.on">1</item>
<item name="wifi.on">1</item>
<item name="wifi.active">487</item>
<item name="wifi.scan">239</item>
<item name="dsp.audio">38</item>
<item name="dsp.video">250</item>
<item name="radio.active">126</item>
<item name="radio.scanning">23</item>
<item name="gps.on">1</item>
<array name="radio.on">
<value>8.3</value>
<value>8.3</value>
</array>
<array name="cpu.speeds">
<value>2649600</value>
<value>2572600</value>
<value>2496000</value>
<value>2457600</value>
<value>2265600</value>
<value>1958400</value>
<value>1728000</value>
<value>1574400</value>
<value>1497600</value>
<value>1267200</value>
<value>1190400</value>
<value>1036800</value>
<value>960000</value>
<value>883200</value>
<value>729600</value>
<value>652800</value>
<value>422400</value>
<value>300000</value>
</array>
<item name="cpu.idle">5.2</item>
<array name="cpu.active">
<value>362</value>
<value>335</value>
<value>293</value>
<value>284</value>
<value>245</value>
<value>198</value>
<value>169</value>
<value>162</value>
<value>137</value>
<value>116</value>
<value>108</value>
<value>95</value>
<value>87</value>
<value>66</value>
<value>59</value>
<value>54</value>
<value>42</value>
<value>34</value>
</array>
<item name="battery.capacity">3220</item>
<array name="wifi.batchedscan">
<value>.0002</value>
<value>.002</value>
<value>.02</value>
<value>.2</value>
<value>2</value>
</array>
</device>

As you can see, contrary to popular believe, the display isn't even factor number one. WIFI usage is almost twice more power consuming than the display ! Not when WIFI is just 'on', that barely uses power, but when wifi is actively doing things. So if you are low on battery, use mobile data instead of wifi. Also WIFI scanning consumes a lot of power !

And high CPU speeds are way more demanding than the screen in itself. Interestingly, GPS almost consumes no battery at all.

So this explains why internet browsing over wifi can be so battery intensive (wifi data traffic + high cpu speeds needed for rendering the QHD screen + the display itself).

Also an example calculation. Let's say you have your CPU maxed out, doing some rendering, while you're downloading over wifi, your screen at max brightness and you have audio playing over bluetooth. So that's:

362 + 487 +223 + 38 + 101 = 1211 ma/hour. So this way you should get roughly: 3220/1211=2 hours and 40 minutes screen on time :)