Quote:
Originally Posted by sirmaru
I charged my Kindle Fire to 100%. Then I used Shut Down Mode for 10 hours.
When I awakened the Fire, the Bettery Meter still registered 100%. Thus, there was no noticeable energy expended on the boot up.
Some have claimed here that using Shut Down Mode expends energy. It does not and the test is readily duplicated by anyone.
Sleep Mode is simply more convenient since it takes less TIME to activate the Fire. Thus, it should be used when the user is awake. However, when the user is asleep, Shut Down Mode saves the most battery energy.
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You are not taking into account the juice sucked in the power down and power up sequences. The screen is full on during those, and it is certainly the biggest juice sucker in the device.
Say your screen uses 500mA, and your fire in sleep only uses 4mA. This means that the time it takes to shut down and power up (say, 90 seconds), would be equivalent to 11250 seconds of sleep time (or about 3 hours). For 2mA in sleep, you get 6 hours.
So, there's a cut-off of a certain amount of hours - if you plan to keep the device off for that long, then a power off is beneficial, otherwise it is better to put it in sleep mode.
Of course, I'm pulling these figures out of my ***, but they're in the ball park.