1. BlackZeppelin's Avatar
    Hi all. Maybe things have changed the last 4 yrs since my Galaxy S5 but I was always lead to believe that fast charging was bad for batteries. Even in settings on the Note 9, there is a disclaimer about the phone possibly getting warm.

    I know there is now adaptive fast charging that puts a high current through at lower battery percentages and throttles back as the battery gets charged.

    Maybe I am going on the old days where fast charging was just a continuous high current load, with suggestions to only use when necessary. But I'm really confused because it has been 4 years since my Galaxy S5.

    Does everyone around here just charge their Note 9 on fast charge?
    09-12-2018 07:29 PM
  2. mfreeland's Avatar
    Note 9 is only QC2.0. I've been using QC 3.0 on my HTC phones (QC2.0 on the older ones) for years. I haven't noticed any damage to the battery in the 2 year intervals that I've had them. I would even buy this phone if it didn't use QC...
    09-12-2018 07:53 PM
  3. bembol's Avatar
    I have the Anker 20100 PowerCore at work and for travel, so I don't use fast charging all the time.

    Am I worried, no because I don't keep my toes long enough to find out.
    bassplayrguy likes this.
    09-12-2018 08:21 PM
  4. Heavens1's Avatar
    I kept fast charge ticked on for my note 8 from the beginning and didn't notice undue heat, nor any other symptoms.

    I've auto left it on on my note 9 as well.

    At various times I've used apps that test battery life etc and not noticed that anything was amiss.
    09-12-2018 08:38 PM
  5. trucksmoveamerica#AC's Avatar
    I turn fast wireless charge off. That's how I charge my phone at night while I'm sleeping, there's no need to fast charge then.
    09-12-2018 09:17 PM
  6. evohicks's Avatar
    I turn fast wireless charge off. That's how I charge my phone at night while I'm sleeping, there's no need to fast charge then.
    Same here, not really had a need for fast charging on this or the Note 8.
    09-12-2018 10:40 PM
  7. NexusGirlX's Avatar
    I use it every time. I also have a Anker 20000 PowerCore that I keep fast charging on also.
    09-13-2018 12:31 AM
  8. Gary02468's Avatar
    I always leave the fast-charge settings enabled. But the wireless charger next to my bed is a slow charger, since overnight charging doesn't need to be fast.
    09-13-2018 05:55 AM
  9. bandofbrothers2112's Avatar
    I top up as and when needed using normal charge and overnight.

    The only time I use fast charge is if I need a quick boost.
    09-13-2018 12:59 PM
  10. EMGSM's Avatar
    All my bricks are fast charging and same with my wireless charger. Don't know if it's bad. It's just what I got.
    09-13-2018 02:36 PM
  11. berfles's Avatar
    I top up as and when needed using normal charge and overnight.

    The only time I use fast charge is if I need a quick boost.
    Same. Fast charge only takes about 30 minutes less anyway.
    bandofbrothers2112 likes this.
    09-13-2018 02:47 PM
  12. music_man185's Avatar
    After thinking about the fact that my Note 9 has not been below 50% in the 2 weeks+ that I've had it, I decided to turn off fast charging. If it was dying during the day and I needed a quick top off, I would leave it on. However, since I put it on the charger when I go to bed, I'm not in a hurry for it to charge. I want this phone and battery to last as long as possible. While fast charging may not cause significant harm, I would have to think that slow charging would still be better. My S7's battery, as well as my wife's, began deteriorating very badly after about a year to a year and a half. I don't want that to happen with my Note.
    09-14-2018 07:03 AM
  13. Richard Stewart79's Avatar
    Samsung stated in the past that fast charge over time I think 300 fast charges that only 80% of the battery remains. The battery will last much longer if charged without fast charge enabled
    09-14-2018 09:05 AM
  14. NexusGirlX's Avatar
    Samsung stated in the past that fast charge over time I think 300 fast charges that only 80% of the battery remains. The battery will last much longer if charged without fast charge enabled
    That will happen regardless of you using fast charging or not. All batteries degrade over time from charging no matter how you charge.

    Someone on these forums asked Samsung about fast charging and was told it would not harm the battery.
    Laura Knotek likes this.
    09-14-2018 09:22 AM
  15. BlackZeppelin's Avatar
    After thinking about the fact that my Note 9 has not been below 50% in the 2 weeks+ that I've had it, I decided to turn off fast charging. If it was dying during the day and I needed a quick top off, I would leave it on. However, since I put it on the charger when I go to bed, I'm not in a hurry for it to charge. I want this phone and battery to last as long as possible. While fast charging may not cause significant harm, I would have to think that slow charging would still be better. My S7's battery, as well as my wife's, began deteriorating very badly after about a year to a year and a half. I don't want that to happen with my Note.
    Yeah my thoughts exactly. In my case, the combination of a very expensive flagship phone, non removable battery and wanting to keep it for a few years compels me to disable fast charging.

    I'd like to update my situation in this regard. I've been using my Note 9 for a few days with standard battery charging. I said in another thread that I won't charge past 90% except for the first number of initial charges. This is to condition the battery properly so that all the cell chemistry is activated.

    The first 3 or 4 charges were painfully slow. A case of the battery's chemistry not yet conditioned. A few more chargers and the STANDARD charging is recharging the battery quite fast, even to my surprise. As a matter of fact I thought that somehow the settings have somehow defaulted back to fast charging. I checked and no, still standard charging.

    And just like I read many times before, the phone now charges very quickly to about 90% but the last 10% is significantly slower. Apparently this remaining charge takes a lot of energy and causes significant battery degradation over time when done consistently.

    So my initial burst of 100% battery charges are finished, the phone is charging very quickly to about 90%, it'll now be a case of limiting charging to that from now on.

    But properly conditioned, you don't have to enable fast charging to have a satisfactory rate of charge.
    09-14-2018 05:25 PM
  16. Richard Stewart79's Avatar
    That will happen regardless of you using fast charging or not. All batteries degrade over time from charging no matter how you charge.

    Someone on these forums asked Samsung about fast charging and was told it would not harm the battery.
    Yes but fast charging reduces the life of the battery faster than normal charging due to the increased heat. Google it or call Samsung. No it doesn't harm the battery but will reduce its life quicker
    09-14-2018 05:45 PM
  17. Mooncatt's Avatar
    I know there is now adaptive fast charging that puts a high current through at lower battery percentages and throttles back as the battery gets charged.
    This is standard charging for Li-ion and Lipo batteries. Adaptive fast charging, Quick Charge 2.0/3.0, and similar charging protocols are using higher voltages, not amperage, to charge quicker than a standard 5V charger.

    Maybe I am going on the old days where fast charging was just a continuous high current load, with suggestions to only use when necessary.
    Do that on a lithium based battery without throttling down as it fills up will risk blowing the battery. No phone would allow that to happen.
    09-14-2018 07:08 PM
  18. bandofbrothers2112's Avatar
    It's certainly interesting to see how we all have our habits when coming to charge the battery.

    I usually will not let mine drop below 15% but have no reservations to letting it charge to 100%

    My thoughts are that when it gets to 90% it goes into trickle mode and when it hits 100% then the phone is clever enough to stop drawing charge but if it drops below 100% while charging and the phone is turned On it'll trickle again to top up.

    I have no links / stats etc to prove this.

    This is from user experience and non scientific observations.
    bassplayrguy likes this.
    09-14-2018 11:44 PM
  19. j_hansen's Avatar
    Yeah my thoughts exactly. In my case, the combination of a very expensive flagship phone, non removable battery and wanting to keep it for a few years compels me to disable fast charging.

    I'd like to update my situation in this regard. I've been using my Note 9 for a few days with standard battery charging. I said in another thread that I won't charge past 90% except for the first number of initial charges. This is to condition the battery properly so that all the cell chemistry is activated.

    The first 3 or 4 charges were painfully slow. A case of the battery's chemistry not yet conditioned. A few more chargers and the STANDARD charging is recharging the battery quite fast, even to my surprise. As a matter of fact I thought that somehow the settings have somehow defaulted back to fast charging. I checked and no, still standard charging.

    And just like I read many times before, the phone now charges very quickly to about 90% but the last 10% is significantly slower. Apparently this remaining charge takes a lot of energy and causes significant battery degradation over time when done consistently.

    So my initial burst of 100% battery charges are finished, the phone is charging very quickly to about 90%, it'll now be a case of limiting charging to that from now on.

    But properly conditioned, you don't have to enable fast charging to have a satisfactory rate of charge.
    It is normal that it charges slow above 90%, it goes to a trickle type charge after that out of the box, if you think it was faster before.... It's in your head
    fernandez21 likes this.
    09-15-2018 09:55 AM
  20. fernandez21's Avatar
    From my understanding, the reason the charge slows down as it gets full is to make sure it doesn’t get overcharged or explode. The way the Tesla employees explained it to about the super chargers is “if you have an empty glass, you can pour water into it fairly quickly without spilling, but as the glass gets full you have to slow down to fill it to the top without making a mess”

    Also, I seem to remember Samsung saying something about how after a year the Note 8 should still have over 90% battery capacity. They said this because every was worried about the exploding batteries.
    09-15-2018 11:25 AM
  21. bassplayrguy's Avatar
    Yes but fast charging reduces the life of the battery faster than normal charging due to the increased heat. Google it or call Samsung. No it doesn't harm the battery but will reduce its life quicker
    Please post a credible source for this information.
    09-15-2018 05:22 PM
  22. wagadesa's Avatar
    From my understanding, the reason the charge slows down as it gets full is to make sure it doesn’t get overcharged or explode. The way the Tesla employees explained it to about the super chargers is “if you have an empty glass, you can pour water into it fairly quickly without spilling, but as the glass gets full you have to slow down to fill it to the top without making a mess”

    Also, I seem to remember Samsung saying something about how after a year the Note 8 should still have over 90% battery capacity. They said this because every was worried about the exploding batteries.
    There are charging algorithms that govern the charging of batteries. The specific standard or algorithm is based on the chemistry of the battery.

    You can read about Lithium Ion charging algorithm here:
    https://ieeexplore.ieee.org/document/6360973/

    IEEE is a credible source for these types of topics... I'm a member.
    fernandez21 likes this.
    09-15-2018 05:40 PM

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