On Sat, Jul 13, 2019 at 10:33:33AM -0700, Tom Norton wrote:
If I leave Osmand loaded and turn the screen off,not turning off the phone, will it still drain the battery?
Unless you turn off the phone (i.e., "shutdown") the battery is being drained. [1] What changes is the amount of drain that occurs.
Maximum drain occurs when everything is on (all radios, all sensors, screen on and at maximum brightness, CPU doing something that requires full power).
Minimum drain occurs when most things are off. Screen off is a big power saver (because in most phones the screen is often the single largest power consuming element).
Actual usage occurs somewhere in the middle (some things are on, others off).
If you are interested in extending battery life between charges, then turning off elements you do not at present need can save power. I.e., if you are not using bluetooth, then switch it off. That tells the OS not to wake the hardware up to even look for other bluetooth devices, saving the power that would be consumed. If you are not using wifi, turn it off also (prevents scanning for access points to connect with). If you don't need cell service, turn that off (turning this off is called 'airplane mode', which also turns off wifi and bluetooth, but both of those can be turned back on separately).
And, of course, keeping the screen off (or on the dimmer settings) as much as possible will save a lot of battery.
But anything you have the phone doing (playing music, running OsmAnd for routing, monitoring a bluetooth dongle, etc.) will consume some power. The more of those you have it doing at the same time, the more total power consumed.
[1] And, if you really want to get into low-level battery chemistry, even then it is "being drained", just so slowly that you are unlikely to notice over typical phone usage timescales.
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