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It's said high voltage will stress battery and wear it out in the long run?

Discussion in 'Android Devices' started by louis2008, Feb 4, 2022.

  1. louis2008

    louis2008 Well-Known Member
    Thread Starter

    From a lot of Google search it's undeniable that it's not recommended to charge a phone fully, not even 90%, best between 25% to 75% at all times because high voltage will stress battery and ruin it in the long run.

    I am wondering, what if someone who can strictly keep the habit of charging and discharging a phone ALWAYS between 25% and 75% which is the ideal practice, then what is the reason of his battery failing at last? I truly believe that his battery will finally fail one day

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  2. puppykickr

    puppykickr Android Expert

    Batteries are designed to last about 2-4 years on average- half may go longer, but half will go less than that.

    Think of charging as a unit, rather than a percentage.
    If you only charge your device to 80% or so, then you are screwing yourself out of potential charge life, which means that you will need to charge more often.

    Batteries and devices both have voltage and heat sensors to prevent damage to the battery.
    (Yes, techically higher charge voltage and temperature can degrade batteries faster anyway, but they will still survive the prescribed amout of time.)

    When you charge a battery from 0% up to 100%, that would be one full charge unit.
    If it was 50% up to 100% then that is half a charge unit.

    So you could do that twice and it would be the same as in the first case.

    These batteries are designed to last a certain number of full charge units, generally typical use over 2-4 years.
    No matter how you divide those units, the total remains unchanged.

    So you are only annoying yourself and not allowing full potential of your battery if you never complete a charge.

    Probably the two worst things are heat and charging from completely dead.
    Avoid these two things if at all possible.

    The rest is useless worry created by people that need to write junk.
    mikedt and ocnbrze like this.
  3. puppykickr

    puppykickr Android Expert

    To answer your other questions:

    All batteries degrade over time.
    This is independent of any use or none at all.
    The battery is a chemical reaction that begins the moment the battery is created.
    This chemical reaction eventually will cease, like all chemical reactions do.
    mikedt and ocnbrze like this.
  4. ocnbrze

    ocnbrze DON'T PANIC!!!!!!!!!

    PitCarver and mikedt like this.
  5. mikedt

    mikedt 你好

    FWIW Google did introduce charging limits with Android 12, where the phone can be set to not charge above a certain amount. On my Galaxy Note20 Ultra, it's stop charging at 85%. I have enabled this, as I rarely use more than 40-50% in a single day with this phone. Although when I'm travelling, I do want to the phone to be charged 100% before I start out.
    PitCarver, Hadron and ocnbrze like this.
  6. louis2008

    louis2008 Well-Known Member
    Thread Starter


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