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Why does my LG L90 battery goes down from 100% to like 80-75% so fast (about 30 mins) and then the battery lasts quite a while? Is it because the battery has been charged only a few times? Because I bought the phone week ago.

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  • Have you recalibrated your battery recently? Jul 30, 2014 at 20:10
  • No, i just charged the phone when the battery was about 15% and that's it.
    – Tim
    Jul 30, 2014 at 22:12
  • I urge you to read this fine article: batteryuniversity.com/learn/article/battery_calibration and then calibrate your battery. If it continues, its a sign that your battery may need replacement. If its in warranty, take it to the manufacturer. Jul 31, 2014 at 12:22
  • Have you rooted your phone and installed a custom recovery?
    – rjt.rockx
    Apr 5, 2015 at 9:28

2 Answers 2

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From the question comments, you have not calibrated your battery (in a long time or ever).

You need to do a proper calibration:

  1. Do a full charge of the device's battery.
  2. Use the device until it turns off on its own. Do a full discharge of the battery. One neat trick is to get some game that has wakelock (does not let the screen turns off) and leave it running with the device on a well-ventilated place.
  3. After the device dies of low battery, wait for it to cool down and turn it on and use it a bit more. When it refuses to turn on at all, its fully discharged.
  4. Plug it in and let it charge to max.

This will set the flags for FULL and EMPTY battery, and the meters should be accurate.

If the problem persists, your battery may be damaged. If the device's battery is still under warranty, take it to the service center.

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  • Do note that you should not leave it in a fully discharged state for long, and in order to fully charge it, it is best that the device is left off during the charge. Dec 11, 2014 at 23:10
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Do you disconnect the charger immediately when the phone reaches 100%? If so Try an overnight charge and see if this behavior persists.

often times a fast charger may well reach a 4.2 volt peak in your battery but not complete the saturation charge phase before announcing 100% charge. in truth however if the saturation phase is not completed the battery is only charged to about 80% which would be bang on what you are seeing.

My L7 II does exactly the same if not charged overnight (or at least a few hours after the green light.

Do this before doing a possibly unnecessary full discharge witch is generally not very healthy for a lipo cell.

If you don't solve your problem thus, go ahead and do the calibration cycle as described by mindwin.

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