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Slow Charging - Max Charging Amps?

So I recently picked up a T813 to replaced my Nexus 7 (2013), I've had a few weeks now, and as with all my devices I slow charge it. This tablet generally took ~30 hours or so to charge at 0.35-0.45 amps, but I didn't think anything of it. This week I went on a trip and plugged it into a charger that can output anywhere from 0.8 to 1.8 amps depending on the port you are using (all the current ratings I'm listing are what I've measured, not what the devices are rated). My tablet said "Charging" at first, but then once it hit 75% all it would say is "Charging Slowly" no matter what. Now that's all it will say. Sometimes after a restart it will say "Charging" briefly, but then it goes back to "Charging slowly". The charger I was trying to use was an Anker product, so not a complete "no-name" charger.
I did some more checking and it appears my tablet has an upper charge limit of 1.5 amps using even the factory charger which is rated 2.0 amps. That same factory charger plugged into my Nexus 5X outputs 1.88 amps. Anything less than 1.5 amps, my tablet behaves as the rest of the devices. If I plug the tablet into a power source that current is limited to 0.5 amp, using the same cable, using an Honor 5X, and the Tab S2, both draw the ~0.5 amp.
Now the "Charging" and "Charging Slowly" messages were on Lineage, however since I have returned home, I and done all the subsequent testing, I have used Odin to return completely back to the factory Samsung software. Right now I have some videos playing to run the battery down, and am planning to trying to charge the battery all the way up using the factory charger to see how long it takes. If it also takes 30 hours, I'm going to assume it has to be a hardware problem?
Anyone else have any ideas?

My T813 arrived with Nougat on it. The only Odin firmware I could find that would successfully flash was a Marshmallow so I let videos play overnight (which did actually play overnight surprisingly!) to fully drain the battery. This morning I started charging the battery with the OEM charger, and from fully dead to 100% it took roughly 4.5 hours. So I would say this is normal from what I've read. I would say this rules out any hardware issue.
My next test will be to find a flashable Nougat OEM image as it doesn't want to update itself. Then see how it performs then. I'm starting to wonder if Samsung changed something in the firmware to make it charge slower on purpose just to prevent any "Note" like issues from happening? Finally then I'll have to also go back to Lineage, as I don't plan on using it at all with the stock software, as it's quite unbearable. There's a reason I only buy devices that Lineage is available for.

So after updating to Nougat, and letting it update, then fully draining the battery again, which again took overnight, it seems to charge even faster. This time from 0-100% taking just under 4 hours using the OEM charger, at roughly 3 hours 45 minutes.
I'll put Lineage back on it tonight, however this definitely calms my concern that I had a hardware issue. It's definitely fine. I'll see what kind of charge time I get with Lineage.

It charges with ~1600mah

I've had slow charging issue twice. I sent it in the first time and Samsung sent me a slow charger (not fast charger) to use. Worked fine for about 10 months. Once I update to Nougat, my charging became slow again.
Seems like many people have slow charging issues with this tablet. I have the Verizon tab s2 9.7

Extreemator said:
It charges with ~1600mah
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Yeah this is what I've noticed. This seems to be about the upper boundary. Despite being shipped with a 2 amp charger. I did reinstall Linage, and it charges fine with the OEM charger, so it's not a bug on their end, or a hardware problem for me. With LOS and the OEM charge it's still ~4 hours to charge with is what I would expect roughly based on my other tests, even though LOS still reports charging slowly.
I think my problem early with the 30+ hours of charge time was related to the hub I was charging with. I have been having issues where I would wake up and my phone wouldn't be charged at all. Most nights it would though, so I figured my cable was starting to go bad. Swapped the cable and same issue. Measured the current on the ports, and it was far below what it should be on a USB port, the charge ports were getting 0.18-0.2 amps, the regular ports were 0.2-0.3 amps (not sure why the regular ports were getting more). Then I noticed the power adapter was not plugged in all the way into the wall. After plugging it in all the way the current on those ports returned to normal. This honestly doesn't make any sense to me, so it maybe time to replace that hub. Either way, I know the problem is not the tablet, which calms my fears about it, since it was the new piece of hardware.

Battery 100% On, 80% Off

phone says 100% but says 80% when off charging
Tried:-
1. 2 different battery callibration apps
2. charging 100%, depleting battery. repeated process a couple of times
3. Switched to Stock (Rooted), 2 Custom ROMs (Waited till it was 100% on both on and off before flashing)
Notes:-
1. Battery seems perfectly fine (takes a while before depleting and doesnt deplete before 0%)
Currently using stock rooted

l would start with replacing the cable and charger to make sure you are getting a full charge. Then monitor the usage time on your phone over a few weeks and see if the time to empty is getting less that is a sure sign of a bad battery

Recheck with another fast charger. Generally, we cannot say if is a faulty cable or you have an faulty adapter. I hope the device chargeboard is not shot/motherboard driven related issue. Also, have you recovered the device using Samsung Kies- Emergency firmware recovery?

gmfirebird said:
l would start with replacing the cable and charger to make sure you are getting a full charge. Then monitor the usage time on your phone over a few weeks and see if the time to empty is getting less that is a sure sign of a bad battery
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Click to collapse
I did try that and surprisingly an apple charger's ETA is 2hrs
I have like 3 fast chargers and they all ETA 6hrs

volcanojax said:
Recheck with another fast charger. Generally, we cannot say if is a faulty cable or you have an faulty adapter. I hope the device chargeboard is not shot/motherboard driven related issue. Also, have you recovered the device using Samsung Kies- Emergency firmware recovery?
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Click to collapse
I tried - original cable with original charger 6hr
- original cable with apple charger 2hr
- different cable with original charger 1.30hr
- different cable with apple charger 2hr
(Used different fast chargers too, same results)
I tried a smart switch recovery. Same conclusion which makes me think its a hardware issue

3zozHashim said:
I tried - original cable with original charger 6hr
- original cable with apple charger 2hr
- different cable with original charger 1.30hr
- different cable with apple charger 2hr
(Used different fast chargers too, same results)
I tried a smart switch recovery. Same conclusion which makes me think its a hardware issue
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With original charger it takes 6hrs!!! Holy ****
I think its a usb port problem for sure.. Do one thing while connected to the charger go to device maintenance and open battery menu and see if it say charging via AC or USB if while us8ng the original charger it shows Chaging via USB then certainly its the port that has gone faulty..
Hit thanks if helped

Hello everyone! Though its not the right place to ask the question but I have been seeking solution to my problem from months. Long time before, my Galaxy Note II started to behave differently. Whenever I charged it completely, the phone worked normally till 75% to 80% and all of sudden a =low battery warning indication appears and phone proceeds to shut down. I tried changing ROM and calibrating the battery again but nothing worked. Finally I replaced the battery with a new one and also clean flashed another ROM in a hope to see if the problem is gone or still there. But to my surprise the problem is still intact. Now, when I turn on the phone the battery is 90% and when I keep using it, it drains normally, but as soon it reaches round about 80%, it turns off randomly. When I turn the phone back on the battery is still at the same percentage level at which is turns off. I believe there is not an issue with the battery. Please help me what to do, I am using TWRP recovery that doesn't gives the battery stats wipe option too. Should I flash a new ROM again? I would greatly appreciate if someone please helps me in sorting this problem.
What I have already done!
1. Replaced the battery
2. Changed the ROM
3. Re-calibrated the battery

3zozHashim said:
I have this weird issue thats been bugging me for a while now. The phone says 100% when im on it but when i power off and charge, it says 86%.
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I have noticed the same issue, I think. I suspect it is a general bug.
Guys, try charging your phone while in Android. When it reads 100%, switch off your device. Either leave the charge cable attached or reattach it after you have switched off. Now wait for the off-line charging icon to appear. Unless I'm mistaken, the percentage won't correspond with whatever your phone reports while your in Android. If Android says 100%, this will be a lower number. And off-line charging will keep on charging until you reach 100%.

Androbots said:
With original charger it takes 6hrs!!! Holy ****
I think its a usb port problem for sure.. Do one thing while connected to the charger go to device maintenance and open battery menu and see if it say charging via AC or USB if while us8ng the original charger it shows Chaging via USB then certainly its the port that has gone faulty..
Hit thanks if helped
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Click to collapse
Sorry for the late response. Internet finished, had to wait until the renewal date. During this time, i wiped the rom and re-installed it (Khongloi V11). Since there was no internet, i didnt sign in any accounts, Switched off the location. The phone surprisingly took 3 days before reaching 0.
Indeed, it says USB Charging 6hrs. I sometimes keep plugging and unplugging, it changes to A/C 2hrs.

I have this problem too. But I change batt_capacity_max to 1000, phone on 100% phone off 100%. If we recharge to full it will return to the same state (phone on 100, phone off ~80) so i need to change again. I don't know if this destroy my battery life ? I don't know why. I thought I'm the only 1 who have this problem? (sorry for my bad english)

I think this may be a software/firmware problem, not a problem with the battery.

Crike said:
I think this may be a software/firmware problem, not a problem with the battery.
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I figured that was the problem but i tried it with three different roms (Khongloi V11, Final, Stock).
Maybe it's some kind of battery protection thing created when your battery is old or something?

3zozHashim said:
I figured that was the problem but i tried it with three different roms (Khongloi V11, Final, Stock).
Maybe it's some kind of battery protection thing created when your battery is old or something?
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Click to collapse
The various ROMs may all use the same battery raportage code, which doesn't account for this discrepancy. After all, most ROMs are just fancy reskins of stock Android.
That said, maybe Samsung support can shed some light on what's going on.
On a side note? Is there anyone who reads this thread, whose reported battery charge (in percentages) is the same in Android as when the device is switched off and charging?

So... any solutions?

Fast charging issues

Hey guys! A few weeks ago I noticed that fast charging doesn't work with my usual power sources (Xiaomi Power Bank, Xiaomi QI Car Charger), even though it worked before that. I only get around 850 mAh with them. The only way it works if I use the original wall charger. I use the original and a Baseus cable. It is also slow with the phone turned off. Any ideas what causes this?

what rom

LilProphet said:
Hey guys! A few weeks ago I noticed that fast charging doesn't work with my usual power sources (Xiaomi Power Bank, Xiaomi QI Car Charger), even though it worked before that. I only get around 850 mAh with them. The only way it works if I use the original wall charger. I use the original and a Baseus cable. It is also slow with the phone turned off. Any ideas what causes this?
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Click to collapse
The fast charge brick is needed to power the basic functions of the charger. I suggest you get the 27W brick in order to get the 20w fast wireless charging

nikolas60 said:
what rom
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Xiaomi.eu ROM, I unlocked the bootloader a few weeks before this issue, but the problem also persists when the phone is turned off. Should I try to flash back the stock ROM with MI Flash?

My mi9 lite phone went slow charging too. Phone usually got a full charge after 2hrs but it went to 4hours to get a full charge after i connected my phone to transfer files to my laptop through a usb cable. What i did to get the 2hrs charging was reconnect my phone to the laptop using the same usb cable. At the phone a pop up appears with 3 choices...1st choice(forgot),2nd transfer files, 3rd transfer photos. I tapped the 1st choice and disconnected my phone. And i got my 2hrs full charging time back. Hope this will help.

I am on 12.0.2 and takes 2 hours to charge 90% mean that ~1.5 minute 1% charge
before flashing this ROM via EDL method took around ~1 hour with the original charger to charge from 20% to 90%

Question about fast charging on the Note 9

Hi...
For a while now I've had a problem with my Note 9 only displaying that it is regular charging when plugged into my fast charger plug and cable. I tried a numbr of troubleshooting steps from restarting, cleaning the port, trying safe mode, buying replacement fast charger and cable, factory settings, rooting but it still only showed as cable charging so I became convinced it was a physical problem with the port. Wireless fast charging continues to work as it should.
I recently installed AccuBattery and when plugged into my fast charger/cable, the charge current completely fills the the green bar to between 1800-2000 mA so now I'm beginning to wonder whether fast charging is working ok, but the phone is reporting it incorrectly.
Does anyone else know what kind of charge current the Note 9 should have when cable fast charging please? Also, just out of curiosity, what should it be when wirelessly fast charging too please?
Thanks for any help...

nickster_uk said:
Hi...
For a while now I've had a problem with my Note 9 only displaying that it is regular charging when plugged into my fast charger plug and cable. I tried a numbr of troubleshooting steps from restarting, cleaning the port, trying safe mode, buying replacement fast charger and cable, factory settings, rooting but it still only showed as cable charging so I became convinced it was a physical problem with the port. Wireless fast charging continues to work as it should.
I recently installed AccuBattery and when plugged into my fast charger/cable, the charge current completely fills the the green bar to between 1800-2000 mA so now I'm beginning to wonder whether fast charging is working ok, but the phone is reporting it incorrectly.
Does anyone else know what kind of charge current the Note 9 should have when cable fast charging please? Also, just out of curiosity, what should it be when wirelessly fast charging too please?
Thanks for any help...
Click to expand...
Click to collapse
I know this is ridiculous question. Did you enable it in battery setting?

nickster_uk said:
Hi...
For a while now I've had a problem with my Note 9 only displaying that it is regular charging when plugged into my fast charger plug and cable. I tried a numbr of troubleshooting steps from restarting, cleaning the port, trying safe mode, buying replacement fast charger and cable, factory settings, rooting but it still only showed as cable charging so I became convinced it was a physical problem with the port. Wireless fast charging continues to work as it should.
I recently installed AccuBattery and when plugged into my fast charger/cable, the charge current completely fills the the green bar to between 1800-2000 mA so now I'm beginning to wonder whether fast charging is working ok, but the phone is reporting it incorrectly.
Does anyone else know what kind of charge current the Note 9 should have when cable fast charging please? Also, just out of curiosity, what should it be when wirelessly fast charging too please?
Thanks for any help...
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Click to collapse
Rosli59564 said:
I know this is ridiculous question. Did you enable it in battery setting?
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Click to collapse
I started charging at 25%. With screen on I got 2700mah.
I left my phone off for 15 mins and stayed at that 2700mah average.
When I turned my phone screen on, I had 45% but screen on charge dropped to 1000mah.
If you look at the bottom of my screenshot, it explains why you need to turn your screen off to get accurate fast charge Numbers. Your phone might throttle the screen on charge if a certain criteria is met.

Once again. Did you enable it in the settings?
I am eagerly awaiting your response... [emoji3]

Rosli59564 said:
I know this is ridiculous question. Did you enable it in battery setting?
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Click to collapse
Thanks for the reply...fast charging is indeed enabled :good:

Frick_trump said:
I started charging at 25%. With screen on I got 2700mah.
I left my phone off for 15 mins and stayed at that 2700mah average.
When I turned my phone screen on, I had 45% but screen on charge dropped to 1000mah.
If you look at the bottom of my screenshot, it explains why you need to turn your screen off to get accurate fast charge Numbers. Your phone might throttle the screen on charge if a certain criteria is met.
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Click to collapse
Thanks for the reply.
Hmmm the numbers you get do seem to suggest there is an issue with my phone. The screen off speeds are around the same as screen on.
Samsung quoted about £10,000,000 to repair as it's rooted and they have to replace the entire board to satisfy their warranty terms.
May have a go at replacing the charging port myself.
Thanks again :good:

nickster_uk said:
Thanks for the reply.
Hmmm the numbers you get do seem to suggest there is an issue with my phone. The screen off speeds are around the same as screen on.
Samsung quoted about £10,000,000 to repair as it's rooted and they have to replace the entire board to satisfy their warranty terms.
May have a go at replacing the charging port myself.
Thanks again :good:
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Click to collapse
I don't use fast charging, ever. So that's probably why my port still works. I have gotten so much dirt in it and cleaned it out it isn't even funny. So I'm less 6 to believe that fast charging is what ruins the port not debris.
A lot of people who use fast charging have the same issue as you-,it burns out the port.
Honestly, my advice is to love with fast charging over wireless and not spend a billion dollars replacing the port. Wait until it's time to replace the battery in a year or two and do it then. Fast charging over cable only saves you 30-40 minutes. I can charge and do charge my phone normally and it only takes around an hour and 40 minutes.

Battery/Charging issue

Hey everyone, how y'all doing?
I've got this problem for 2 months now where the charging has been super slow and no idea why. I am using the official charger and cable that came with the phone, I used my wife's s20's charger with same result and a third party charger with 3 different cables with similar results. Accubattery recorded that my phone's battery health is at 86% (3460mah) should I change it and lose my water/splash proof?
Oh yes I have flashed a few different ROMs (currently using Dr Ketan) with the same results except for evolution ROM, with the aosp ROM I was able to charge my phone from 14 percent to 100 in 90 minutes which is kinda weird...
Any advice would really help thank you

Supracer said:
Hey everyone, how y'all doing?
I've got this problem for 2 months now where the charging has been super slow and no idea why. I am using the official charger and cable that came with the phone, I used my wife's s20's charger with the same result and a third party charger with 3 different cables with similar results. Accubattery recorded that my phone's battery health is at 86% (3460mah) should I change it and lose my water/splash proof?
Oh yes I have flashed a few different ROMs (currently using Dr Ketan) with the same results except for evolution ROM, with the aosp ROM I was able to charge my phone from 14 percent to 100 in 90 minutes which is kinda weird...
Any advice would really help thank you
Click to expand...
Click to collapse
Get yourself one of those 2$ USB doctors. It will tell you how much power the phone is taking in. i.e. Fast charge should be 9 volts at about .8 amps and slow charge 5 volts at 1.5+ Amps.
Make sure your port is clean and moisture levels are low i.e should be below 80%.
I had this problem once when moisture was over 80%. It then went away. But at that time the phone will warn you about the extra moisture. It will say Moisture detected in USB port Fast Charging disabled.
The second time this happened was after the update to android 10. Had slow charging and overheating and audio acting up but that went away after re-setting the phone a few times and clearing cache.
The latest update to Android 10 seems to be causing a lot of issues with Display, Audio and overheating / slow charging. My audio chip finally stopped working. And the phone is now with Samsung.
My 2 cents if you see overheating and slow charging. Stop using the phone while its still working and take it to Samsung. Because if you continue to use it something will fail. And Samsung will want to give you a big fat bill to change it.

RonChinoy said:
Get yourself one of those 2$ USB doctors. It will tell you how much power the phone is taking in. i.e. Fast charge should be 9 volts at about .8 amps and slow charge 5 volts at 1.5+ Amps.
Make sure your port is clean and moisture levels are low i.e should be below 80%.
I had this problem once when moisture was over 80%. It then went away. But at that time the phone will warn you about the extra moisture. It will say Moisture detected in USB port Fast Charging disabled.
The second time this happened was after the update to android 10. Had slow charging and overheating and audio acting up but that went away after re-setting the phone a few times and clearing cache.
The latest update to Android 10 seems to be causing a lot of issues with Display, Audio and overheating / slow charging. My audio chip finally stopped working. And the phone is now with Samsung.
My 2 cents if you see overheating and slow charging. Stop using the phone while its still working and take it to Samsung. Because if you continue to use it something will fail. And Samsung will want to give you a big fat bill to change it.
Click to expand...
Click to collapse
Thanks for the advice and I'll see to it. It's just yeah it seems like after android 10 things have been degraded

So apparently turning off fast charging in options gives me a faster charge time. With fast charge on it takes from 7% to 100% in 3 and a half hours and with fast charge off it takes 2 hours only.... Maybe my fast charging "chip" / "module" is broke?

Supracer said:
So apparently turning off fast charging in options gives me a faster charge time. With fast charge on it takes from 7% to 100% in 3 and a half hours and with fast charge off it takes 2 hours only.... Maybe my fast charging "chip" / "module" is broke?
Click to expand...
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Have you tried installing the stock OS back onto your device?

iceepyon said:
Have you tried installing the stock OS back onto your device?
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Yes I have tried, the June update one and got the same results. I even formatted everything and went bone stock with the same results. I'm thinking of using some contact cleaner on the usb port but hesitant to do that...

Supracer said:
Yes I have tried, the June update one and got the same results. I even formatted everything and went bone stock with the same results. I'm thinking of using some contact cleaner on the usb port but hesitant to do that...
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Unless you see something in there I do not advise poking around inside.
I suspect your problem is that the Samsung USB cable packed up. And your trying with all kinds of cables and chargers. Go to a Samsung Store and ask them to check with a Samsung Cable and Charger.
I went thru this circus a few months back.
The only solution is to get a Samsung Charger with a Samsung Cable.
Then make sure fast charge is on. For wireless and wired charging. Wipe your cache and you should be ok.
I have seen way too many damaged USB ports from people trying to clean it. When there was nothing in there to start with. Use compressed air. If you see something in there.