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I am about to upgrade from Android K to Android L. Right after, I will upgrade from Android L to Android M.

In a previous empirical experiment, with a now-demised device, I noticed (or seem to have noticed) that the battery life seriously degraded after upgrading Android.

Even after a good month of daily charging and discharging (from 0% to 100% and back), in the vain hope of properly recalibrating the battery, the lifetime was still down to about 8-10 hours from about 14-16 hours.

This time I would like to be able to prove it.

What is a canonical battery test that I can run (now and after upgrading) to determine whether upgrading deteriorated the battery life? I imagine that viewing a 6-hour YouTube video and noticing how far it goes would do the trick, but it's also very skewed to a single task. Is there an alternative that better represents the daily activities with an Android phone?

Update:

In addition to beeshyams's answer I'd like to point to Firelord's suggestion to use GSam, which does provide an ongoing "Averages Per Complete Charge".

GSam screenshot

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By now you would have long upgraded, but answering this hoping it may help anybody read it.

  • "What is a canonical battery test that I can run (now and after upgrading) to determine whether upgrading deteriorated the battery life? Battery usage depends on so many parameters. The list is possibly endless but few examples are highlighted below, leading to the conclusion that designing a canonical test is impractical from end user point of view

    • Device/ carrier specific -CPU (frequency range, governor, number of cores) , GPU( frequency range, Mali blobs), screen (LCD, AMOLED and it's variants, brightness), network (2G,UMTS,3G,4G,LTE etc)
    • Usage Specific - activating sensors (like GPS, proximity which drain battery faster), social network apps which keep the device on always, type of sites visited and how long (plain text, multimedia), upload/download (also depends on host server traffic etc)
  • Related to this, is that there seems to be no standard definition that defines average use. See my question How is an "average use" defined in terms of battery life. Answer to that question may help you in understanding how industry tests are carried out.
  • Even after a good month of daily charging and discharging (from 0% to 100% and back), in the vain hope of properly recalibrating the battery - Battery calibration is a myth, see answer here

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