01-15-2021 04:45 AM
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  1. RyMac04's Avatar
    For the past two nights my s7 edge has suddenly died. Out of nowhere. From around 35% to 0% instantly. No new apps have been installed.

    When I plug it in, the battery charges up from 0%.

    Check out the screenshot. Any solution to this? About a 2 year old s7 edge.
    Attached Thumbnails Battery drops from ~35% to 0% instantly-screenshot_20180301-232751.jpg  
    03-02-2018 01:13 AM
  2. chanchan05's Avatar
    For the past two nights my s7 edge has suddenly died. Out of nowhere. From around 35% to 0% instantly. No new apps have been installed.

    When I plug it in, the battery charges up from 0%.

    Check out the screenshot. Any solution to this? About a 2 year old s7 edge.
    It's a 2 year old battery. You need a new one.
    03-02-2018 01:24 AM
  3. RyMac04's Avatar
    It's a 2 year old battery. You need a new one.
    Fair - but I would simply expect faster drain if the battery was a problem.

    I can't understand why it's normal battery life and then suddenly dead?
    03-02-2018 02:29 PM
  4. chanchan05's Avatar
    Fair - but I would simply expect faster drain if the battery was a problem.

    I can't understand why it's normal battery life and then suddenly dead?
    Batteries don't degrade the same way. It could be a circuitry problem inside the battery that cuts power when it reaches that voltage point.
    RyMac04 likes this.
    03-02-2018 08:49 PM
  5. Mooncatt's Avatar
    Fair - but I would simply expect faster drain if the battery was a problem.

    I can't understand why it's normal battery life and then suddenly dead?
    All batteries, regardless of type will experience something called voltage sag. Heck, you even see this with your AC power for your home when the lights dim for a split second whenever something like the air conditioning kicks on and draws a lot of power.

    In short, any time a demand is placed on the battery, the voltage will drop for a bit. This is natural and to be expected, but the amount of voltage loss is minimal on a healthy battery. As a battery ages and the internals breakdown, the amount of voltage loss increases. The amount of demand you put on the phone affects this as well. I.e. Gaming would result in more of a voltage sag than just sitting idle.

    What makes Li-ion batteries unique is that they can not be discharged to 0 volts and then recharged (at least not without special care and equipment, and even then it's not guaranteed). 0% on your battery gauge is not zero voltage. It's the lowest the battery can go and still be safely recharged.

    So what you are experiencing is what happens when these two issues intersect. As your battery gets low, something is putting a power demand on the weakened battery that causes the voltage sag to dip below the cutoff point. When this happens, it's an instant shutdown as if you pulled the battery. This usually isn't noticed at first because it may start at 5% or so, which most people would've already plugged in before then. It'll only get worse from there. So you keep using your phone not knowing this is getting worse and worse, except maybe for shortened usage time between charges, until it finally starts sagging so much that the cutoff happens before you'd plug it in.

    Hopefully this helps clear it up for you. As a side note, this instant shutoff is what Apple was trying to avoid when they started slowing down their phones with weak batteries. By throttling performance, the voltage sag wouldn't be as bad, letting you keep using the phone longer without the instant shutdown. Not that this is necessarily a good thing, as Li-ion batteries hate being deeply discharged and letting people keep doing so like this could actually speed up the degradation.
    03-02-2018 09:23 PM
  6. RyMac04's Avatar
    Wow. Thank you MoonCat. That's really interesting and informative. Now I know.
    03-03-2018 02:19 PM
  7. Mooncatt's Avatar
    Wow. Thank you MoonCat. That's really interesting and informative. Now I know.
    "And knowing is half the battle."

    ...I couldn't help myself. XD
    03-03-2018 03:44 PM
  8. neddyuk's Avatar
    I have been getting exactly the same problem and mine is about 22 months old now shame its not like the old days in just swapping the battery by unclipping the back cover now you have to play with heat guns and adhesive.
    03-06-2018 11:57 AM
  9. jimjonesG7's Avatar
    So whats the solution??? by mid-day my edge battery life is 50% always have to take my charger and charge at least twice a day to get through a full day
    03-07-2018 03:43 PM
  10. Mooncatt's Avatar
    So whats the solution??? by mid-day my edge battery life is 50% always have to take my charger and charge at least twice a day to get through a full day
    For the OP, the solution was pretty obvious that he needed to replace the battery. Is yours also shutting off before hitting zero on the battery gauge? If so, then the same applies to you. If you are noticing increased battery drain but haven't had it shut down early on you, then it's a little more tricky.

    Sure, it very well could be that the battery is bad. Especially if it's over a year old, has been repeatedly drained below 20%, held at levels above 75% (I.e. Overnight charging), or exposed to excessive heat. It could also be new/updated apps are simply using more resources to run and the only option there would be to uninstall them or deal with it. It could also be something buggy in the system needing a system cache clear, or a rogue app needing a cache or full data clear.
    03-07-2018 03:50 PM
  11. RyMac04's Avatar
    FWIW I've seen improvement after wiping the cache partition. But certainly I still need a new battery/phone.
    03-08-2018 12:30 AM
  12. natehoy's Avatar
    So whats the solution??? by mid-day my edge battery life is 50% always have to take my charger and charge at least twice a day to get through a full day
    Best option: Replacing the battery with a brandy-new one. $20-30 for the battery itself, some tools to make it easier, and a couple fairly risky (!) hours of effort and bam! new battery life. Not for the faint of heart, and may never be water resistant again, but doable. Spend some extra on one of the really well-reviewed ones, your labor is the real cost here!

    https://www.ifixit.com/Teardown/Sams...Teardown/56686


    Short of replacing the battery, you can add a battery case.

    Cost: About $30-50 on average.
    Advantage: Will give you long battery life before your internal battery even starts to discharge, no risk of damage to your phone by ripping it apart to get at the battery.
    Disadvantage: Makes your device bigger and heavier, keeps your internal battery at 100% while in use so it degrade slightly more quickly.


    You can also get a wireless charging pad for work, so all you have to do is drop the phone on it rather than plugging it in all the time. You may find that more convenient, at least...


    Or of course there are battery packs, but that means you are carrying around your phone, a cable, and a battery pack. A decent alternative if you need to be in meetings a lot during the day. It's the cheapest option and very effective if you don't mind walking around with a cable plugged into your phone and leading in to your pocket or backpack.

    Or, sort of a hybrid solution, a few companies make QI wireless charging battery packs - so you can have a no-cables way to add some charge to your phone where outlets might not be conveniently available. Pull out the battery pack, turn it on, and set your phone on top of it.
    03-16-2018 12:43 PM
  13. Minion Mangala's Avatar
    Thank for the extensive explanation. You sir deserve an award for the time you took to write that comment.
    12-19-2018 06:27 AM
  14. punk999's Avatar
    Hi, was this problem solved for you? I'm having the exact same problem, battery reaches 30% and drains rapidly to 0%
    06-23-2019 10:01 AM
  15. chanchan05's Avatar
    Hi, was this problem solved for you? I'm having the exact same problem, battery reaches 30% and drains rapidly to 0%
    Same solution. Basically get a new battery. It's a hardware issue, not something any tweak can fix.
    06-23-2019 09:36 PM
  16. testtesttesttesttesttesttest's Avatar
    It is not a ""normal wear and tear". If it was it, it wouldnt get from 35% to 0. it would start with 10, 15 20 etc.
    thats firstly.
    And secondly, there is something called planned planned obsolescence. Samsung strategy is following:
    We will make an awesome device which blow people away. But they put batteries which doesnt last that long. Fortunately its not something like some companies *cough* do with their updates and slow down their devices. but anyway.
    Unfortunately for you and all samsung users, only way is to switch phone or replace battery. happens with my s8 and irritates me too. But its not just lifespan of battery. I had galaxy S4 for 5 years, and i didnt replace its battery (good ol easy battery switch times). back then samsung was hungry for reputation, but now they are hungry for money......
    07-17-2019 12:24 PM
  17. belodion's Avatar
    It is not a ""normal wear and tear". If it was it, it wouldnt get from 35% to 0. it would start with 10, 15 20 etc.
    thats firstly.
    And secondly, there is something called planned planned obsolescence. Samsung strategy is following:
    We will make an awesome device which blow people away. But they put batteries which doesnt last that long. Fortunately its not something like some companies *cough* do with their updates and slow down their devices. but anyway.
    Unfortunately for you and all samsung users, only way is to switch phone or replace battery. happens with my s8 and irritates me too. But its not just lifespan of battery. I had galaxy S4 for 5 years, and i didnt replace its battery (good ol easy battery switch times). back then samsung was hungry for reputation, but now they are hungry for money......
    Welcome.

    I don't believe that any manufacturers do that. Android Central would deprecate such claims, unless backed by proof.

    This is also relevant to this thread: https://forums.androidcentral.com/sh...d.php?t=500054
    07-17-2019 02:03 PM
  18. Mooncatt's Avatar
    If it was it, it wouldnt get from 35% to 0. it would start with 10, 15 20 etc.
    thats firstly.
    Already explained in my comment above.

    And secondly, there is something called planned planned obsolescence. Samsung strategy is following:
    We will make an awesome device which blow people away. But they put batteries which doesnt last that long.
    Conspiracy theory at best. If this were the case, there would be a lot more complaints about it.

    Fortunately its not something like some companies *cough* do with their updates and slow down their devices. but anyway.
    Also already explained in my comment.

    Unfortunately for you and all samsung users, only way is to switch phone or replace battery.
    Not just Samsung, but all brands. No one makes a forever battery.

    back then samsung was hungry for reputation, but now they are hungry for money......
    All companies are hungry for money. It's why they are called a business and not a charity.
    07-17-2019 02:12 PM
  19. RyMac04's Avatar
    OP here... It's interesting re-reading this a year later on a galaxy s9+ with 21% left after 14h and 23m of use today.

    No, they don't make batteries that last forever. But they've sure made ones that last all day and then some. As discussed, the issues with your batteries can mostly be attributed to simply being old. That was the case with mine.
    07-18-2019 12:19 AM
  20. ragnarok687's Avatar
    OP here... It's interesting re-reading this a year later on a galaxy s9+ with 21% left after 14h and 23m of use today.

    No, they don't make batteries that last forever. But they've sure made ones that last all day and then some. As discussed, the issues with your batteries can mostly be attributed to simply being old. That was the case with mine.
    My Galaxy S9 has recently suddenly starting dying when it hits 30% battery remaining. I've only had it for 15 months, and in fact had a repair carried out under warranty after 9-10 months of ownership. Samsung ran a battery diagnostic on it and said it had only lost 3% of original battery condition, which I put down to my strict regime of only letting the battery deplete down to 30%, then charging to about 80% max as this was the recommended charging regime.

    Fast forward 6 months and this forum seems to be saying that I've gone from 3% degradation to my battery being practically junk?! What a rip! I'd kinda hope that after forking out £700 on a handset and carefully protecting the battery that it would last at least two years! With my old Galaxy S4 that lasted 5 years and I only swapped the battery once.
    09-24-2019 07:29 AM
  21. B. Diddy's Avatar
    Batteries can also develop something called a dendrite, which is unfortunately not recoverable: https://www.electronicproducts.com/P...batteries.aspx. It's possible that's what happened to your battery. This kind of thing can happen even when you're doing all the right things.
    09-24-2019 12:52 PM
  22. chanchan05's Avatar
    My Galaxy S9 has recently suddenly starting dying when it hits 30% battery remaining. I've only had it for 15 months, and in fact had a repair carried out under warranty after 9-10 months of ownership. Samsung ran a battery diagnostic on it and said it had only lost 3% of original battery condition, which I put down to my strict regime of only letting the battery deplete down to 30%, then charging to about 80% max as this was the recommended charging regime.

    Fast forward 6 months and this forum seems to be saying that I've gone from 3% degradation to my battery being practically junk?! What a rip! I'd kinda hope that after forking out £700 on a handset and carefully protecting the battery that it would last at least two years! With my old Galaxy S4 that lasted 5 years and I only swapped the battery once.
    No matter how expensive a device is, the lithium ion batteries we have now are essentially the same tech that was created in 1993. Sure we've found out how to make them smaller, how to pack more energy in a smaller packet, how to make them more resistant to heat and quick charge and all that, but all the inherent flaws of the tech remain. That's why the research is in trying to use different materials for batteries.

    If that battery formed dendrites inside it or air bubbles due to heat or anything, it severely hampers performance and can create battery issues. The care practices only help in preserving charge cycles, but it doesn't prevent those flaws from appearing. Not to mention that the location of where the flaw formed inside the battery is critical too. There is no technology in the world right now that can guarantee this won't happen.
    Laura Knotek and B. Diddy like this.
    09-25-2019 12:03 AM
  23. Rukbat's Avatar
    which I put down to my strict regime of only letting the battery deplete down to 30%, then charging to about 80% max as this was the recommended charging regime.
    I don't know who "recommended" that, but it's wrong. Charging to 100% and letting the charger stay connected for hours after that is no problem if the charger chip is working properly, otherwise it could cook the battery. So charging to 98% or 99% is a safety measure.

    Discharging past 40% is bad for the battery. Even lower than 50% is, but 45% doesn't shorten the life too much. 30% does.

    Fast forward 6 months and this forum seems to be saying that I've gone from 3% degradation to my battery being practically junk?
    No, what you have is a battery that's developing a dendrite. That's caused by the way lithium batteries work, and has been a problem since they were first developed. It's rare, but it does happen. (Which is why we don't see cheap electric cars with lithium batteries. Dendrites can occur in the first week, or the battery can slowly die over 5 years without ever developing one - and the car manufacturers aren't willing to take the risk. We want thin and light phones, and lithium batteries are the only way to get them.)

    With a dendrite it's luck. You can mistreat the battery (say, by discharging it to 0% every charge cycle) and never get a dendrite, or run between 90% and 50% and get one.

    And dropping from 30% to 0% screams dendrite. Just start charging it at 45% (and charge it up to almost 100%).
    09-28-2019 02:51 PM
  24. WagMD's Avatar
    I'm having a similar problem with my s8.
    The battery will stay at 100% for one or two hours then drop by 20% or so. It will then drop till it gets to 30% (or so) and then dies.
    The other thing is, on occasion, I will charge the phone, take it off the charger and then right away or within a few minutes drops to 0 and auto shuts down.
    I am thinking it needs a new battery too.
    07-03-2020 08:22 PM
  25. mustang7757's Avatar
    I'm having a similar problem with my s8.
    The battery will stay at 100% for one or two hours then drop by 20% or so. It will then drop till it gets to 30% (or so) and then dies.
    The other thing is, on occasion, I will charge the phone, take it off the charger and then right away or within a few minutes drops to 0 and auto shuts down.
    I am thinking it needs a new battery too.
    Hi, welcome!

    Yeah sounds like a battery replacement.
    07-03-2020 08:27 PM
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