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As we all uses phone. Sometimes there may happen that our phone's battery low and we have no resources to charge our battery. What is the best solution for preventing our mobile to off while our mobile in on battery saver mode.

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This link might be helpful to you.

In general, killing extra background processes and possibly switching off Bluetooth, Mobile Data and even WiFi for short durations of time will help extend the life of your smartphone. Putting your phone on airplane mode is also an effective strategy but you obviously won't be able to receive calls then.

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in addition to the already mentioned things you can also turn off GPS and disable the automatically sync settings in your phone. Also there is an option "restrict background processes" in settings, in this option select the apps you do not frequently use and disable them.

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I keep hearing the 80/20 rule.

Use it until about 20% and then charge it until around 80%.

I try to keep to that and my battery health is good save for me jailbreaking and running it down a percent or two.

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Modern batteries are practically not affected by memory problems: as a consequence their life can literally be measured by a composition of switch on time, operating temperature, total current drained.

This means that you need to minimize all those factors: reduce the current needs (for instance by switching off unused applications or background tasks), reduce temperature (avoiding heavy enclosures or similar things), switch off the phone when not needed (f.i. during the night).

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Lithium-ion batteries ability to hold charge decreases over time, and some factors may hasten that demise. Two main factors which will accelerate degradation of batteries are:

  1. Depth of Discharge

  2. Temperature when charging/operating

In order to minimise DoD losses, when possible charge battery before it drops down to zero.

As for temperature degradation, charge/operate the phone away from sources of heat such as laptop fan outlet/TV/radiator/other chargers.

Other tips which others did not mention that may help you with (slight) energy conservation.

  1. Change your background to black .
  2. Constant colour icon theme.

    • For OLED/AMOLED screens set desktop icon theme to green only (think Pip-Boy 3000).
    • For LCD screens stick with white icons. White does not consume any additional power, some amount of energy (likely negligible) is needed to power the filters which produce other colours.
  3. Reduce CPU frequency, to reduce overall power consumption.

If using Android device you can achieve above quite easily with Tasker, it can automatically turn on your additional custom tweaks when standard powersaving mode is enabled.

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