Galaxy S9 Fast Charging but it's no faster than normal
Discussion
I'm on my second Galaxy, previous one being an S7 Edge. I've had my S9 for about 4 months and have a strange thing going on with the fast charging.
I turn fast charging on, connect to the Samsung supplied wall plug using the Samsung supplied USB cable and it'll say for example " Fast charging, 30% charged, approximately 1hr until fully charged".
I disconnect it from the charger, turn fast charging off and get exactly the same timeframe for it being fully charged so it's not that it is the wrong cable/ plug so won't fast charge, it thinks it is fast charging but going by the timeframe, it's not.
I've reset it and rebooted a few times and it's made no difference. Any suggestions? The only issues I can find online is where the phone will refuse to fast charge giving an error message but I don't get any errors just no improvement in charge time when trying to use fast charging.
I turn fast charging on, connect to the Samsung supplied wall plug using the Samsung supplied USB cable and it'll say for example " Fast charging, 30% charged, approximately 1hr until fully charged".
I disconnect it from the charger, turn fast charging off and get exactly the same timeframe for it being fully charged so it's not that it is the wrong cable/ plug so won't fast charge, it thinks it is fast charging but going by the timeframe, it's not.
I've reset it and rebooted a few times and it's made no difference. Any suggestions? The only issues I can find online is where the phone will refuse to fast charge giving an error message but I don't get any errors just no improvement in charge time when trying to use fast charging.
Fast charging is complicated.
USB 2 original standard only allowed 2.5w, that could take a large smart phone battery 4-5 hours to charge, if you were drawing power to the phone it could be a lot longer so fast charging ignored the standard and went well over this limit. USB 3 has a 7.5w limit, which is a lot more useable, and although fast charging may offer power levels well beyond this, there is likely to still be a limit on the amount of power you can feed into the battery which you might already be at or close to.
What I suspect you would find is that with fast charging on, you could run a resource hungry app with full screen brightness and lots of data use and still get a similar charge time, but with it turned off you'd see that charge time go up a lot.
USB 2 original standard only allowed 2.5w, that could take a large smart phone battery 4-5 hours to charge, if you were drawing power to the phone it could be a lot longer so fast charging ignored the standard and went well over this limit. USB 3 has a 7.5w limit, which is a lot more useable, and although fast charging may offer power levels well beyond this, there is likely to still be a limit on the amount of power you can feed into the battery which you might already be at or close to.
What I suspect you would find is that with fast charging on, you could run a resource hungry app with full screen brightness and lots of data use and still get a similar charge time, but with it turned off you'd see that charge time go up a lot.
Not sure why there would need to be an option to turn fast charging off.
But as was said above fast charging is a very complicated subject especially when it come to Samsung, as in the S9 they did not use the latest incarnation of fast charging available at the time. This is why you rarely get really fast charging with wireless chargers.
But it sounds like whether you turn the option on or off you are always getting the fast charge time. An hour for a 70% to full IS fast. What you are classing as normal is the fast charge time.
An hour to fully fast charge, there is no problem.
But as was said above fast charging is a very complicated subject especially when it come to Samsung, as in the S9 they did not use the latest incarnation of fast charging available at the time. This is why you rarely get really fast charging with wireless chargers.
But it sounds like whether you turn the option on or off you are always getting the fast charge time. An hour for a 70% to full IS fast. What you are classing as normal is the fast charge time.
An hour to fully fast charge, there is no problem.
I've not really looked at this in detail, but I've noticed that the fast charge rate seems to be different in different circumstances. Eg, if the battery is close to empty it seems to get 15-20% in very quickly, but if it's at 80% already it doesn't seem to go as hard.
I assumed that the properly fast fast charge was heating the battery too much to run for a full charge, so it's limited to the first xx% and only if you *really* need it, ie the battery is almost empty. And I assume there's some sort of monitoring of the battery feeding into the algorithm too, so if you've been using the phone and it's hot, it goes slower.
I assumed that the properly fast fast charge was heating the battery too much to run for a full charge, so it's limited to the first xx% and only if you *really* need it, ie the battery is almost empty. And I assume there's some sort of monitoring of the battery feeding into the algorithm too, so if you've been using the phone and it's hot, it goes slower.
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