Database Users

[Fast Charge] Results, observations, testing

So I was a bit skeptical about practical use cases for the fast charging. I made a general observation after the first few days. It's currently completely not scientific. But it seems when I disabled the fast charging, my phone seemed to handle battery life way better. Idk how efficient the energy is when done via fast charge, but I've always heard that a slow steady charge is better for lithiums.
I figured maybe this could cover the impacts of fast charge and whether people have noticed similar things. (Day 4)

h3ck said:
So I was a bit skeptical about practical use cases for the fast charging. I made a general observation after the first few days. It's currently completely not scientific. But it seems when I disabled the fast charging, my phone seemed to handle battery life way better. Idk how efficient the energy is when done via fast charge, but I've always heard that a slow steady charge is better for lithiums.
I figured maybe this could cover the impacts of fast charge and whether people have noticed similar things. (Day 4)
Click to expand...
Click to collapse
Looking forward to your findings!

I disabled fast charge the day I got it. Seems pointless to me since the only time I charge is at night. It's a cool feature if I need a charge in 20 minutes but the note 3 I gave my wife would charge in no time as well.
Battery life is great so far for me.
Sent from my SM-N910V using XDA Free mobile app

I've been testing this as well. I leave fast charging on and I'm seeing an easy 14 or so hours off charger with 4 to 5 hours screen time.
Fast charging is incredible. My last charge cycle I recorded was 56% to 98% in 28 min. That's about 1.5% per minute. Though I suspect soome non linearity as it gets closer to 100%.
As far as the longevity of a charge based on regular or Gast charging . There will Likley be no correlation. The charge circuit will handle the incoming current appropriately and the battery is built to handle it. I am a EE and am intimately familiar with battery technology. The charger itself changes its output voltage for fast charging (stepping up the voltage but lowering the current) and I'm at sure there is some software as well as special hardware controls in place to ensure the battery is charging effeciently.
The usual problem with charging batteries too fast is due to heat build up in the battery. However, these new batteries were developed to solve these problems. I wouldn't worry about it.

Here are my results with just over 3 hours of screen time
Sent from my Galaxy Note 4 on Verizon unlimited!

I love quick charge. Nuff sedd lol!

After a whole day on wifi in the office plus weak cellular signal inside the building destroys the battery, I plug it in for 15-20 minutes and I'm good for a whole night. Love it.
Sent from my VK810 4G using Tapatalk

18 hours off battery, 4hrs screen time, and still 19% battery.

I wouldn't care if fast charging destroyed my battery every 6 months. I'd buy another for $20, but it's not going to do that.

lMO battery life doesn't seem good cause fast charge doesnt really fully charge phone

I went back to the slow charger for overnight charging and battery life has been pretty darn good. When I use the fast charger it says it gets to 100 quickly but I feel it drops down way faster. Anyone else feel this way?

yeah, same happened with the note 4. I only use the fast charger when i need a quick charge. I use my old note galaxy tab s regular charger overnight.
Sent from my Moto X Pure Edition

Yeah. Fast chargers are great (the one included with MXPE is superb) but they're not meant for overnight-leave-your-phone-on-the-charger-for-6-or-7-hours-while-you-sleep type charging. Technically, the less you leave your phone on ANY charger after it reaches 100% the better it is for your battery.

EdCarden said:
Yeah. Fast chargers are great (the one included with MXPE is superb) but they're not meant for overnight-leave-your-phone-on-the-charger-for-6-or-7-hours-while-you-sleep type charging. Technically, the less you leave your phone on ANY charger after it reaches 100% the better it is for your battery.
Click to expand...
Click to collapse
This used to be true, but I thought it's been debunked with current battery technology. Recent source anywhere?

No source... IMO. (And the fellow XDA members that replied to this thread)

stu5797 said:
No source... IMO. (And the fellow XDA members that replied to this thread)
Click to expand...
Click to collapse
He was asking for the source saying it is better to disconnect your phone once it gets 100% battery...
It's been proven it has no ill effect over time, and after charging to full it will stop charging until it discharges enough to need a trickle charge, at which point it will trickle back up to 100% and repeat the process.
If you have ever had a battery pack shut itself off after charging your phone to 100%, it's because it finished charging and didn't discharge quickly enough before the battery pack shut off.
Sent from my XT1575 using Tapatalk

I never use my rapid/turbo/quick charger (or whatever it's called). I only use the regular old overnight charger. I get great battery life. I know for a fact that heat is bad for all electronic components including batteries as can be read about in numerous articles on the subject. However, I also wonder about rapid charging to 100% why would the charge not last as long? Unless something that is reading the battery capacity is not accurate when the battery has been rapidly charged?

I don't have any scientific evidence. I just find I get better battery life using the old charger and noticeably worse battery using the rapid charger

I use the rapid charger and the battery life is the same with or without it.

EdCarden said:
Yeah. Fast chargers are great (the one included with MXPE is superb) but they're not meant for overnight-leave-your-phone-on-the-charger-for-6-or-7-hours-while-you-sleep type charging. Technically, the less you leave your phone on ANY charger after it reaches 100% the better it is for your battery.
Click to expand...
Click to collapse
I agree with this, my phone was on 15% and I was about to fall asleep so I left it plugged in for about 9 hours, and it was almost dead with 2hrs SOT and 5 hours after being unplugged. But if I unplug it when it's at 80-90% it lasts me almost all day and into the night.
Sent from my XT1575 using Tapatalk

razieltov said:
I use the rapid charger and the battery life is the same with or without it.
Click to expand...
Click to collapse
Same here. Rapid charge is awesome, and my battery life is very good as a business user.

I agree that fast charging is great for a temporary quick charge but not good using it to get your phone to 100%

How long does your s8 take to charge full from around 5%?

I have the feeling my s8 doesnt really fast recharge even if it's enabled (i'm on 2nd charge now)... how long does it usually take you guys to charge it full when its very low, around 5%? And how long does it say it takes on the notification? Thanks!

About 1h50 or something with normal charge, not fast charge.

Duskfall89 said:
About 1h50 or something with normal charge, not fast charge.
Click to expand...
Click to collapse
Mine definately took longer to charge than that the 2nd time (the first one i was asleep so i dont know) and with fast charge. Does it matter which side you plug in the cable or it's the same? I'm getting worried.

The side of the cable does not matter. I normally charge my phone when it's about 15% and with normal charge it takes around 1h40. Next time I charge it around 5% I will check but I think it's about 1h50 to 2h. My S7 was definitely faster in charging.

Takes about 90 minutes with fast charge

Around an hour and 20-30 minutes, a bit slower when I'm using wireless fast charging.

Did you notice a substantial difference between normal charge and fast charge? Lat time I checked it was about 10 minutes difference until full charge. I expected more, it was much better on the S7.

I think that fast charging got capped by samsung after all the note 7 exploding battery horror stories. And it got capped at 2.45amp fast wired charging and around 1.35 with fast wireless charging since the nougat update on the galaxy s7. when it was around 2.8 fast wired and 1.8 fast wireless charging on MM
Beside the charging rate cap, the fone is much cooler while fast charging now as it used to get crazy hot reaching temps above 42c while now it never gets over 36.smthing.
So while its slower i guess its a much better bet for the battery health and your safety.
Normal wired charging didnt change between MM and nougat and its around 1.7~1.8amp
These are my findings using the s7 and s8 exynos international versions and the statments above are purely my own opinion and experience which could be different for everyone.

I noticed that mine never goes over 1060ma while charging using Ampere. It takes about 1 hour 40 minutes to "fast charge" but it is cooler than any other phone I've ever had while charging.
The sad thing is that it REALLY takes longer if you are using the phone, like barely increasing its %. I even tried changing cables, chargers and places but now I know I'm not alone and this is how it works.
I have an Exynos.

pakitos said:
I noticed that mine never goes over 1060ma while charging using Ampere. It takes about 1 hour 40 minutes to "fast charge" but it is cooler than any other phone I've ever had while charging.
The sad thing is that it REALLY takes longer if you are using the phone, like barely increasing its %. I even tried changing cables, chargers and places but now I know I'm not alone and this is how it works.
I have an Exynos.
Click to expand...
Click to collapse
IMO ampere is crap and slow to report, you need an app that can report as fast as cpufloat. As once you turn on the screen the charging rate will default to ~1amp regardless of the charging mode your using and thats when ampere starts to measure.
Use cpu float for info at glance
Or
Use accubattery to even help you distnguish which charging cables your using gives you the best charging rate.
Hope this helps

Vcaddy said:
IMO ampere is crap and slow to report, you need an app that can report as fast as cpufloat. As once you turn on the screen the charging rate will default to ~1amp regardless of the charging mode your using and thats when ampere starts to measure.
Use cpu float for info at glance
Or
Use accubattery to even help you distnguish which charging cables your using gives you the best charging rate.
Hope this helps
Click to expand...
Click to collapse
Back when I had my Galaxy S4 I used "CurrentWidget: Battery" which was really nice but is not working anymore so I installed Ampere.
I just tried both apps you mentioned and both gave me the 1050am right away. I'll try later on since I was at 90% and if I remember thats the point where it starts to throttle down the current.
I like the AccuBattery 80% cycle though, not sure I can really use it since I prefer to go with a full battery for the entire day.
Thank you!

Mine takes around 1hr 30 mins , The other night i turned fast charge off as i was going to leave it charge throughout the night but i actually forgot i had turned it off and had been charging for a few days with fast charge off..... surprisingly i noticed no difference! It still took around the same time to charge haha

Vcaddy said:
I think that fast charging got capped by samsung after all the note 7 exploding battery horror stories. And it got capped at 2.45amp fast wired charging and around 1.35 with fast wireless charging since the nougat update on the galaxy s7. when it was around 2.8 fast wired and 1.8 fast wireless charging on MM
Beside the charging rate cap, the fone is much cooler while fast charging now as it used to get crazy hot reaching temps above 42c while now it never gets over 36.smthing.
So while its slower i guess its a much better bet for the battery health and your safety.
Normal wired charging didnt change between MM and nougat and its around 1.7~1.8amp
These are my findings using the s7 and s8 exynos international versions and the statments above are purely my own opinion and experience which could be different for everyone.
Click to expand...
Click to collapse
You hit it on the nose. They slowed it to avoid the whole exploding battery problems just to play it safe. Also why they didn't cram a bigger battery inside it to keep heat down.
They lost a lot of money because of that. The only thing that really saved them was that some iPhones were blowing up too
Sent from my Samsung SM-G950U using XDA Labs

Hi all!
Takes around 1 h 40 mins for a full charge. This is using the Fast Charger that comes in the box.

Duskfall89 said:
About 1h50 or something with normal charge, not fast charge.
Click to expand...
Click to collapse
Don't you fast charge?
Sent from my SM-G955F using Tapatalk

thahim said:
Don't you fast charge?
Sent from my SM-G955F using Tapatalk
Click to expand...
Click to collapse
I don't see a big difference between fast and normal charging. I only fast charge when I'm in a hurry.
Gesendet von meinem SM-G950F mit Tapatalk

pakitos said:
Back when I had my Galaxy S4 I used "CurrentWidget: Battery" which was really nice but is not working anymore so I installed Ampere.
I just tried both apps you mentioned and both gave me the 1050am right away. I'll try later on since I was at 90% and if I remember thats the point where it starts to throttle down the current.
I like the AccuBattery 80% cycle though, not sure I can really use it since I prefer to go with a full battery for the entire day.
Thank you!
Click to expand...
Click to collapse
Bear in mind that the charging rate will default to 1050ma whenever the screen is turned on no matter what charging mode your using.
To use my method in cpufloat app, open the app n keep it floating on your screen. Turn of the screen for awhile ( lets say 5 seconds) and n turn the screen back on. You will have a split second to read the current before it updates to the 1050ma. ( you can slow the update rate in the app settings btw.
Accubattery will have 2 readings, charging rate when screen on, charging rate with screen off.

Vcaddy said:
Bear in mind that the charging rate will default to 1050ma whenever the screen is turned on no matter what charging mode your using.
To use my method in cpufloat app, open the app n keep it floating on your screen. Turn of the screen for awhile ( lets say 5 seconds) and n turn the screen back on. You will have a split second to read the current before it updates to the 1050ma. ( you can slow the update rate in the app settings btw.
Accubattery will have 2 readings, charging rate when screen on, charging rate with screen off.
Click to expand...
Click to collapse
Yup, I noticed that, thanks!
Accbattery showed me a maximum of 1156ma obviously it was charging with the screen off. From there my test starts since this charge was done using a multi-usb charger and had something else charging and wasn't using the original cable. We will see
Thanks once again!

Duskfall89 said:
I don't see a big difference between fast and normal charging. I only fast charge when I'm in a hurry.
Gesendet von meinem SM-G950F mit Tapatalk
Click to expand...
Click to collapse
What other difference you want?

The charging issues on the Galaxy S8 seem to be widespread. I was hoping the most recent software update would help resolve these issues but it hasn't. Extremely slow charging (71% charged, 3 hrs 17 mins to 100%) and random connectivity (wireless charging paused) with Samsung's OEM wireless charger. What I've found with respect to the wireless issue, if I leave the phone on the charging pad after a few minutes it will eventually engage to a slow charge mode. Direct charging with the Samsung 2.0 Adaptive makes no difference, still a very slow charge. The normal Fast Charge Notification which should appear at the bottom of the display has never appeared and the tab remains grey in the Advanced Battery Settings even when enabled. Prior to purchasing the phone I had read and was advised by a Samsung tech the phone was suited to accept Qualcomm's 4+ Quick Charge. That seems unlikely at this point. Just got off a live chat with Samsung Support, not surprising the tech offered no solutions which I hadn't already experimented with. Booting up in Safe Mode to see if the app(s) were the problem, clearing system cache, app cache, using a variety of adaptives and cables, updating software, checking the C jack for connectivity. The S7 Edge I had previous to the S8+ was a great phone, no problems whatsoever. I honestly feel that Samsung is dragging their feet and haven't yet gotten their hands around these issues. Seriously, do they really want to experience another wide ranging battery concern? I think not. I can get a refund or replace the S8+ (SM-G955FD) but I'm wondering if the problems may be so widespread it could easily be an issue with the replacement phone. From the research I've done these issues are popping up on all models, regardless of the manufactures location.

Battery health on 6t

Does anybody noticed the battery health of 6t draining faster ..
I'm talking about capacity of battery
After 4 cycle of accubattery app it shows around 3600 mah battery but my phone is brand new its been a 10 days till i bought .. is my battery faulty or is it okay ?

STARK0711 said:
Does anybody noticed the battery health of 6t draining faster ..
I'm talking about capacity of battery
After 4 cycle of accubattery app it shows around 3600 mah battery but my phone is brand new its been a 10 days till i bought .. is my battery faulty or is it okay ?
Click to expand...
Click to collapse
Accubattery does not work correctly on the OnePlus.

Try ampre

mine420 said:
Try ampre
Click to expand...
Click to collapse
Okay buddy

Yeah, mine after I unplugged (100) it shows 98 and sometime 99 in less than 2 minutes without using my phone at all ... And all my apps are not running in the background just a few never had this problem before I did factory reset clear cache and all that but still ...

ANTICHRISTJC said:
Yeah, mine after I unplugged (100) it shows 98 and sometime 99 in less than 2 minutes without using my phone at all ... And all my apps are not running in the background just a few never had this problem before I did factory reset clear cache and all that but still ...
Click to expand...
Click to collapse
Same here. Battery quickly drains to 96% after unplugging from the charger. Takes half an hour max without using at all. After that normal drain.

reppi said:
Same here. Battery quickly drains to 96% after unplugging from the charger. Takes half an hour max without using at all. After that normal drain.
Click to expand...
Click to collapse
May be new update is buggy ?

Since the last release I decided to stick with Nova Prime and no Google Companion. Before I was on stock launcher and turned off shelf. Charged to 100% and over night battery drained to 99%.Right now I am at 77% with 2 hrs of screen time and been unplugged for 16 hrs.
I would think that shelf or Google Discover is a battery drain for sure.

STARK0711 said:
May be new update is buggy ?
Click to expand...
Click to collapse
I don't think so. It's happening on custom ROMs as well. For me it started from one day on another. Weird thing but I think that's the ACTUAL capacity of the battery. You'll actually never have 100% battery when unplugging from the charger after some longer charging. It just shows you that.

reppi said:
Same here. Battery quickly drains to 96% after unplugging from the charger. Takes half an hour max without using at all. After that normal drain.
Click to expand...
Click to collapse
At least I'm not the only one with this problem... Hope this can be fixed .. because is kinda annoying.

STARK0711 said:
Does anybody noticed the battery health of 6t draining faster ..
I'm talking about capacity of battery
After 4 cycle of accubattery app it shows around 3600 mah battery but my phone is brand new its been a 10 days till i bought .. is my battery faulty or is it okay ?
Click to expand...
Click to collapse
I noticed as well. I think its because of my extended use of fast charging as isn't good for the battery. But I thought that the heat was going to the charger and you should use the charger that comes in the box.
However, from extended use of my 6T and my previous phone the OnePlus 3. Dash charging affects the battery even though heat doesn't go to the phone, it affects the battery health. And you shouldn't use it especially if you want to keep the phone for 2+ years. I've been using my 6T since December and my battery health is around 70%?! I only been using dash charge as well for both of my 6T and OP3. The reason I upgraded was because of the degraded battery in my OP3. From this, I'm gonna send my 6T back to OnePlus for a battery replacement, so that I get a brand new battery and from now on I'm never gonna use dash charge and instead gonna use quick charge 2.0 chargers as I don't have a apple 5V charger. But this should still be better for long term, even if it is a form of fast charging. All Samsung phones since the S7 have been having this quick charge standard. Using fast chargers is convenient, but it is not good for long term and it is just another scummy way for companies to reduce the longevity of your device and make you buy a new one. Tbh Dash Charging or Warp Charging or any fast charging should only be used when you're in a rush and you're phone's battery is low

Extreme_Ninja2099 said:
I noticed as well. I think its because of my extended use of fast charging as isn't good for the battery. But I thought that the heat was going to the charger and you should use the charger that comes in the box.
However, from extended use of my 6T and my previous phone the OnePlus 3. Dash charging affects the battery even though heat doesn't go to the phone, it affects the battery health. And you shouldn't use it especially if you want to keep the phone for 2+ years. I've been using my 6T since December and my battery health is around 70%?! I only been using dash charge as well for both of my 6T and OP3. The reason I upgraded was because of the degraded battery in my OP3. From this, I'm gonna send my 6T back to OnePlus for a battery replacement, so that I get a brand new battery and from now on I'm never gonna use dash charge and instead gonna use quick charge 2.0 chargers as I don't have a apple 5V charger. But this should still be better for long term, even if it is a form of fast charging. All Samsung phones since the S7 have been having this quick charge standard. Using fast chargers is convenient, but it is not good for long term and it is just another scummy way for companies to reduce the longevity of your device and make you buy a new one. Tbh Dash Charging or Warp Charging or any fast charging should only be used when you're in a rush and you're phone's battery is low
Click to expand...
Click to collapse
Thanks buddy noticed this issue too .. while charging on regular charger it's fine shows almost 3700 as health but on dash charger it shows much lower

So i figured something interesting ...
The ideal capacity of oneplus 6t is 3700
But rated or we can say usable capacity is of 3610mah ..
So according to that accubattery is almost right ...

Hey!
I got a new device one week ago. Felt the same. As soon as I unplug, it starts to tick. Battery backup is up for 24 hours only. But I have seen many say that it lasts longer. Suggestions? ? I did one update after getting the device. That's it. Even before it was the same situation.

saraofficial said:
Hey!
I got a new device one week ago. Felt the same. As soon as I unplug, it starts to tick. Battery backup is up for 24 hours only. But I have seen many say that it lasts longer. Suggestions? ? I did one update after getting the device. That's it. Even before it was the same situation.
Click to expand...
Click to collapse
In the beginning I had a similar issue. Drain up to approx. 85% went fairly quick,but afterwards the drain will improve drastically. Takes some time I think

reppi said:
In the beginning I had a similar issue. Drain up to approx. 85% went fairly quick,but afterwards the drain will improve drastically. Takes some time I think
Click to expand...
Click to collapse
You mean to say that drain will stop? Sorry just wanted to clarify. ?

saraofficial said:
You mean to say that drain will stop? Sorry just wanted to clarify. ?
Click to expand...
Click to collapse
It did for me at least. Otherwise it's an app issue.
I only have the "issue" that battery goes from 100 to 96% fairly quick but I don't really care. Drain afterwards is normal and getting over 10hrs SOT easily anyway.

reppi said:
It did for me at least. Otherwise it's an app issue.
I only have the "issue" that battery goes from 100 to 96% fairly quick but I don't really care. Drain afterwards is normal and getting over 10hrs SOT easily anyway.
Click to expand...
Click to collapse
Yah 10+ some occasions ... So not a big deal .. and this rated capacity issue seems to be in all one plus devices .. so nothing to worry about ...i guess so

reppi said:
Same here. Battery quickly drains to 96% after unplugging from the charger. Takes half an hour max without using at all. After that normal drain.
Click to expand...
Click to collapse
Mine does this but I noticed that if I reboot my phone every morning before taking it off the charger, this issue goes away. So I'm guessing there is some sort of trickle charging happening once the batter reaches capacity. I also notice if I take the phone off the charger as soon as it hits 100%, battery does not drain to 96% quickly as well. Must be something with the way one plus software works with charging

Leroy Lee said:
Mine does this but I noticed that if I reboot my phone every morning before taking it off the charger, this issue goes away. So I'm guessing there is some sort of trickle charging happening once the batter reaches capacity. I also notice if I take the phone off the charger as soon as it hits 100%, battery does not drain to 96% quickly as well. Must be something with the way one plus software works with charging
Click to expand...
Click to collapse
Yah it's a tricky may be preventing battery from unusal degrading ...
Nonetheless battery backup is just amazing ..im on staock oos9.0.13 and this is what i got its amazing ....

How do you charge?

There are so many options.
Superfast charging I find amazing. Quick plugin and the phone is back up to about 80% battery in no time at all.
Fast is ok. Just a little slower.
Standard is slow, it just ticks over.
I also notice that it appears to stop charging when the battery is full. Although I've stopped leaving my phone plugged in overnight.
But, I read that superfast might damage the battery and that's why it defaults to off. It's not a quick switch to enable/disable, so it's a decision to have fast or superfast on.
Or is life too short to worry?

sjrixon said:
There are so many options.
Superfast charging I find amazing. Quick plugin and the phone is back up to about 80% battery in no time at all.
Fast is ok. Just a little slower.
Standard is slow, it just ticks over.
I also notice that it appears to stop charging when the battery is full. Although I've stopped leaving my phone plugged in overnight.
But, I read that superfast might damage the battery and that's why it defaults to off. It's not a quick switch to enable/disable, so it's a decision to have fast or superfast on.
Or is life too short to worry?
Click to expand...
Click to collapse
Even if super charging would make the battery loose efficiency over time, I don't think it will be a noticeable problem during first owners time with the phone. I will upgrade in less than 18 months and I think most ppl upgrade within 2 years.
Sent from my SM-T865 using Tapatalk

Fast wireless charger most of the time, but I did buy a couple super fast wired chargers to scatter around when I'm in a time crunch
Sent from my SM-N986U1 using Tapatalk

Super Fast wireless charging all day everyday. I haven't plugged a cable into a phone since 2018. Battery life is solid so I'm never in a rush to charge a phone. Wireless is quick enough. I love the convenience of just throwing it in the stand without having to find the cable and stick it into the port. Especially in a dark room.

I've not really used wireless charging. So you have 15w wireless pads around the house?

Super fast charge too.
With PPS and the PD standard, it changes its power according to of the actual battery level and temp (and certainly more parameters) to avoid harming it.

I plug in every night, overnight next to my bed. Not fast charging, just regular charge, because it's not needed.
If you don't need to fast charge every day, turn it off. Doing it regularly will degrade long term battery life by a small amount. Both by the method of charging, and by the heat created by fast charging, as heat is bad for the life of a battery.
But all in all, it's not terrible. Just charge it howver you want. It's not going to cause any terminal issues. Just charge it when and however you want to.

I have switched off both Superfast as well as fast charging. Not sure if that will have any impact positive or negative as my opinion is that Samsung didnt go with 40W, 60W so on and so forth charging not because it cant do it (If Oppo,Vivo, Xiaomi can then Samsung definitely can) but as a bigger company they probably wanted to act more responsibly so they must have ensured that their 25W charging has negligible effect on battery and thats why they went with it. Just my 2 cents.