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Extend battery life at 20 - 80%

Discussion in 'Android Lounge' started by Rgarner, Nov 20, 2018.

  1. Rgarner

    Rgarner Android Expert
    Thread Starter

    I recently read that to keep a battery at its best requires not letting its charge drop below 20% or rise above 80. Is this true? Is it actually a bad idea to leave a phone plugged in all night?
     

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  2. Mikestony

    Mikestony ~30% Carbon Black ±
    Moderator

    Give or take a few percentage points, yes that's what I've heard also.
    Do I follow that recommendation? Not really.
    I leave mine plugged in all night even though it reaches full charge in approx 4 hours depending on how low it was when the charge started, and after reaching 100%, it's still plugged in a few more hours until I wake up. :eek:
     
    Rgarner likes this.
  3. Deleted User

    Deleted User Guest

    Same here. I also don't let the battery discharge completely. I read somewhere that's bad for it.
     
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  4. kate

    kate Dreaming of Bugdroid.
    Moderator

    Heard that as well, supposedly fully discharging and fully charging them put a bit more stress on the battery and decreases its life time a little.

    Keeping it charged around 20-80, 25-75, or in that general area will give you more charging cycles according to tests.

    Could be worth doing when convenient, especially with a non-replaceable battery, but if it's at 20% and you have to go to bed I wouldn't stress over charging it all night.
     
    Mikestony likes this.
  5. lvt

    lvt Android Expert

    25% is considered by many people as a critical battery level, 20% seems even worse.
     
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  6. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    But in reality my previous phone's battery was ok for 3 years and "acceptable" for the 4th, despite always charging it fully overnight (I did try not to run it flat, but didn't rush off to charge it at 25%). So it does depend how much you value optimising that vs convenience. I personally don't have time to worry about very fussy charging regimes.
     
    Rgarner likes this.
  7. lvt

    lvt Android Expert

    Maybe quick-charge kills the battery faster than overcharging might do (technically you can't overcharge).
     
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  8. Rgarner

    Rgarner Android Expert
    Thread Starter

    I guess I don't have to worry about that unless it means charging it on airplane mode or while it's shut off completely.
    I have done that. The battery's probably not strong enough for fast charging.
     
  9. lvt

    lvt Android Expert

    If you're not in a hurry, for example the night, you can use a regular charger to charge the phone until full. Slow charging helps reducing harmful stress and heat on the battery.
     
    Mikestony likes this.
  10. merrymann

    merrymann Lurker

    I use the battery until it off but it is still in good condition and sometimes I forget to disconnect the charger once the battery is fully charged. I don't have any idea whether it is Good or bad.
     
  11. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    Not disconnecting when fully charged isn't an issue.

    Running the battery until the phone shuts down on a regular basis is definitely bad for it.
     
    lvt and Mikestony like this.
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