Database Users

Why does this charge so SLOW?

I am completely satisfied with my nexus 7 but it seems to be charging ridiculously slow. So slowly that even browsing with my screen on low, my battery still goes down while its plugged in. And a 1 hour charge with my nexus off only charges it like 20 percent or less while my samsung galaxy player charges 65 percent. I have tried 2 different USB cables and chargers.
Sent from my Nexus 7 using xda app-developers app

Oops I should have put this in q&a! My bad!
Sent from my Nexus 7 using xda app-developers app

Only use genuine charger which came with .
Other phone chargers will not work.
Sent from my Optimus 2X using Tapatalk 2

considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.

simms22 said:
considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.
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Click to collapse
Yep.
USB 5v @ 500ma
Phone charger 5v @750-1000ma
Nexus charger [email protected]
Ipad charger [email protected]
Im sure you can see why a phone charger won't do the job
Sent from my Optimus 2X using Tapatalk 2

Even using the charger that came with it, it still takes a good three or four hours to fully charge it.

brando56894 said:
Even using the charger that came with it, it still takes a good three or four hours to fully charge it.
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Click to collapse
A suburban fills up much slower than a Harley.
Sent from my paranoid Nexus 7.

Its a 4000mah battery. Its gonna take a little time to fully charge.
Sent from my Nexus 7 using xda premium

I live in Singapore, can't find a proper 3 pin wall charger for the nexus7..
Sent from my Nexus 7 using Tapatalk 2

Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster

nexusboy01 said:
Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster
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Click to collapse
I vouch for this. I use my Touchpad charger and it charges to full from almost 10 percent to full in less than 3 hours.
Sent from my Nexus 7 using Tapatalk 2
---------- Post added at 08:07 PM ---------- Previous post was at 08:06 PM ----------
SPreston2001 said:
Its a 4000mah battery. Its gonna take a little time to fully charge.
Sent from my Nexus 7 using xda premium
Click to expand...
Click to collapse
Correct, the bigger the battery the longer the charging time.
Sent from my Nexus 7 using Tapatalk 2

nexusboy01 said:
Get a HP touchpad international charge kit from Amazon one of the members recommended it to me, it charges in about 2hr 45 minutes full charge faster than the official Charger. Make sure u turn off or nexus to charge the battery faster
Click to expand...
Click to collapse
Be careful as the faster a battery charges the hotter it gets and the hotter it gets the faster it's performance and life decrease (all batteries life and charge levels will slowly decrease over time and after soo many charge cycles as parts of it very slowly kinda burn out and are unusable). Also why even fast chargers SHOULD slow down when you hit roughly 90 - 95% as it is not good to cram power that fast in to lithium ion when close to full as this causes the loss of parts of the battery more quickly. Usually it can be apps that can slow things down as well. like my boss kept complaining his phone are 3 batteries a day until a week later I convinced him to get rid of unneeded apps and low and behold it came right back. This is due to apps requesting what's called a wake lock basically telling the device to not go to sleep. This is needed to do syncs, scans and the like, but poorly written apps can juggle wake lock poorly causing bad battery usage when they don't need to.
My tablet charges in roughly 2.5 hours from dead to full using stock charger which is GREAT for a 4000 maH battery.
I also highly recommend turning the OS off and charging via charge only screen (where you see only battery graphic filling up) that would not involve any apps messing with the device while charging.
Also not good to leave device on charger longer than roughly 30 min past full as this could then have charger throttle between fast and slow charge over time (usually due to imperceptible power fluctuations tricking the circuits in the charger to reset and it takes it a sec to realize the battery charge level and adjust back) while battery is full which is very bad to have it in fast charge when it's full as stated (the charger not talking of what some folks call a fast charge mode on some devices (usually used in some way to speed up charging when using a computer USB port)) and is why even manufacturers will warn you if this sort of thing (that is if you read caution statements or manuals)
Sent from my Nexus 7 using Xparent Green Tapatalk 2
---------- Post added at 08:35 PM ---------- Previous post was at 08:16 PM ----------
simms22 said:
considering theres much less voltage going through when using the usb(not wall charger) to charge, its normal for it to charge slow. and normal for it to lose battery % while charging it via usb and using the device.
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Click to collapse
Very true depends on how hard you are running the device. Streaming movies in this mode most likely you will see a loss while simply checking news feeds or light internet browsing it still gains percentage.
Sent from my Nexus 7 using Xparent Green Tapatalk 2
---------- Post added at 08:49 PM ---------- Previous post was at 08:35 PM ----------
ahmadmfz said:
I live in Singapore, can't find a proper 3 pin wall charger for the nexus7..
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
You mean like this one? I know it's not from Google but is specific to nexus 7 and Kensington usually makes good chargers:
http://www.daydeal.com/product.php?productid=19029
Search for nexus 7 international charger
Sent from my Nexus 7 using Xparent Green Tapatalk 2

Some computer motherboards also offer a high-power mode for USB ports, specifically for charging handheld devices. For instance, here's ASRock's solution.

happyjack96 said:
I am completely satisfied with my nexus 7 but it seems to be charging ridiculously slow. So slowly that even browsing with my screen on low, my battery still goes down while its plugged in. And a 1 hour charge with my nexus off only charges it like 20 percent or less while my samsung galaxy player charges 65 percent. I have tried 2 different USB cables and chargers.
Sent from my Nexus 7 using xda app-developers app
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Click to collapse
I think it charges normally. I come from an iPad 3, which take 6.5hours hours to charge from 0 to 100%. I'm satisfied with 3.5 hours with the N7.
Sent from my Nexus 7 using Tapatalk 2

My Nexus 7 charges from dead to 100% in about 3 hours. That's not slow at all.

At what percentage do you charge your nexus 7?

What is the best point to charge at for battery longetivity?? I don't know anything about batteries.. would be good top know
Sent from my Nexus 7 using Tapatalk 4

Interesting question. I charge it when it say "connect you charger"
Sent from my Nexus 7 using Tapatalk 4

i agree. i charge it when it tells me it needs to be charged

clockmehigh said:
What is the best point to charge at for battery longetivity?? I don't know anything about batteries.. would be good top know
Sent from my Nexus 7 using Tapatalk 4
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Click to collapse
The battery in a nexus 7 flo is a Lithium ion battery (as one would expect). This particular kind of battery lasts longer if you top it off all the time (Meaning you should charge it whenever you can). A table and explanation can be read here: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

What the first reply said. I charge when it's time to do so.
Sent from my Nexus 7 using Tapatalk 4

I did some reading on battery university some time ago and concluded the best way to save battery health is to keep it as much as possible between 40 and 80%, as well as try to not leave it full or completely discharge.
I've been using this method on my phone for more than a year and the battery hasn't noticeably lost capacity.
Sent from my HTC One X using xda app-developers app

I charge it whenever possible, Battery nowadays trickle charge so always plugged in does not damage battery longevity. Install Gsam battery monitor and you will see even during charging the battery doesn't get much hotter than 30C and Lithium batteries is fine at temps below 45C.

asp2010 said:
I did some reading on battery university some time ago and concluded the best way to save battery health is to keep it as much as possible between 40 and 80%, as well as try to not leave it full or completely discharge.
I've been using this method on my phone for more than a year and the battery hasn't noticeably lost capacity.
Sent from my HTC One X using xda app-developers app
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Click to collapse
Yes I've heard this before.
Sent from my Nexus 7 using Tapatalk 4

Its on a charger when I am not using it. Unless I am on the road.

tweaked said:
Its on a charger when I am not using it. Unless I am on the road.
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Click to collapse
+1 for me. When I pick it up to use it, I like it a 100% charge. I don't always know when I first disconnect it, if I am going to use it for 5 minutes or 5 hours. If I waited until it called for a charge and picked it up with, say, 25% power, I would be screwed if I wanted to use it for a long period of time. I wish they came with swappable batteries like a phone, so I could get a couple of spares, keep them optimally charged and then switch when the one in the N7 got low. Alas.

I charge mine while I sleep. Haven't ran it dead yet.

PJ Clifford said:
+1 for me. When I pick it up to use it, I like it a 100% charge. I don't always know when I first disconnect it, if I am going to use it for 5 minutes or 5 hours. If I waited until it called for a charge and picked it up with, say, 25% power, I would be screwed if I wanted to use it for a long period of time. I wish they came with swappable batteries like a phone, so I could get a couple of spares, keep them optimally charged and then switch when the one in the N7 got low. Alas.
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Click to collapse
Best solution is a portable power pack, it just adds some extra bulk. Someone will eventually release a battery pack case to take advantage of the wireless charging.
Is it still the case that the earlier you recharge, the longer your battery will survive? I haven't run my Nexus 7 into the red so far, which is pretty easy to avoid when it lasts for longer on one charge than I could ever imagine using it non-stop.

There was an article on Gizmodo that recommends not to let it go below about 40%. I would post a link, but XDA's not letting me.

asp2010 said:
I did some reading on battery university some time ago and concluded the best way to save battery health is to keep it as much as possible between 40 and 80%, as well as try to not leave it full or completely discharge.
I've been using this method on my phone for more than a year and the battery hasn't noticeably lost capacity.
Sent from my HTC One X using xda app-developers app
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Click to collapse
This. You guys that are allowing it to reach the point where it tells you to change are causing premature wear on your batteries, especially if you allow it to reach the point of turning itself off. Nothing is going to immediately fail, you're just going to start wearing out your battery faster. We'll all eventually reach that point of reduced capacity or inability to accept a charge.

techToys7 said:
There was an article on Gizmodo that recommends not to let it go below about 40%. I would post a link, but XDA's not letting me.
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Click to collapse
I'd be leary of gawker information. They really aren't the best place to get accurate advice.

I just fully charge it and then let it to go till 3-12 before charging it again.
Not trying to charge alot and trying to keep the cycle from 0-100 again and again

Beaverman20 said:
The battery in a nexus 7 flo is a Lithium ion battery (as one would expect). This particular kind of battery lasts longer if you top it off all the time (Meaning you should charge it whenever you can). A table and explanation can be read here: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
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Click to collapse
I try charge my devices before they hit 50%. Doing so will about double the longevity of you batteries. Of course their are times when this is not possible, but with a car charger and several QI wireless chargers it not a problem most of the time.
---------- Post added at 04:03 PM ---------- Previous post was at 04:02 PM ----------
Hnk1 said:
I just fully charge it and then let it to go till 3-12 before charging it again.
Not trying to charge alot and trying to keep the cycle from 0-100 again and again
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That is the worst way to do it with modern Li-ion batteries.
---------- Post added at 04:08 PM ---------- Previous post was at 04:03 PM ----------
spackmanbr said:
This. You guys that are allowing it to reach the point where it tells you to change are causing premature wear on your batteries, especially if you allow it to reach the point of turning itself off. Nothing is going to immediately fail, you're just going to start [Ware] out your battery faster. We'll all eventually reach that point of reduced capacity or inability to accept a charge.
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Click to collapse
Exactly!

asp2010 said:
I did some reading on battery university some time ago and concluded the best way to save battery health is to keep it as much as possible between 40 and 80%, as well as try to not leave it full or completely discharge.
I've been using this method on my phone for more than a year and the battery hasn't noticeably lost capacity.
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
Do you only let it charge to 80%, or do you let it charge to 100%?

Kookas said:
Do you only let it charge to 80%, or do you let it charge to 100%?
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Only up until 80%. If you have to charge close to 100%, at least try not to leave it in that state for long, since that's what damages the battery. Also, try not to discharge below 10%.
Of course, these are all just guidelines. You battery will degrade anyway, it's just a matter of time. There will be minimal impact if you do a full charge-discharge cycle from time to time, but the less often you do it, the better for your battery :good:
Sent from my Nexus 7 using xda app-developers app

Kookas said:
Best solution is a portable power pack, it just adds some extra bulk. Someone will eventually release a battery pack case to take advantage of the wireless charging.
Is it still the case that the earlier you recharge, the longer your battery will survive? I haven't run my Nexus 7 into the red so far, which is pretty easy to avoid when it lasts for longer on one charge than I could ever imagine using it non-stop.
Click to expand...
Click to collapse
That's a possibility. Do you have any recommendations?

[Q]How to charge the battery in the right way?

I bought my N4 about 4 month ago,recently I found that the battery life of it from bad to worse...I has connected the extended battery nearly half a day,and charge all night when I sleeping.Does those behavior make the battery bad?How can I repair it or replace a new battery?
Sent from my Nexus 4 using xda app-developers app

brantzlee said:
I bought my N4 about 4 month ago,recently I found that the battery life of it from bad to worse...I has connected the extended battery nearly half a day,and charge all night when I sleeping.Does those behavior make the battery bad?How can I repair it or replace a new battery?
Sent from my Nexus 4 using xda app-developers app
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Click to collapse
Avoid using extended battery life.. Charge your phone til 100% and used it till gets to/around 10% and then charge it again so that the charging cycle is fixed. If you are rooted make a full wipe and install any ROM you like with some good kernels out there that matches the ROM. :good:
It might also be a rough app that you recently installed. Use BetterbatteryStats or Wakelock detector this will show you what is causing the unwanted deadlocks and causing battery drain. :good:
Hope this helps you.
Press thanks I helped you.

Hi I'm new to nexus 4 and have a battery question. I didn't want to start a new thread. I bought a slightly used nexus 4 and charge it to 100% after only a minute of use it immediately starts to drop. Is this normal? I ask because I had an HTC sensation that I charged to 100% and could at least get 10 minutes of use before battery started to drop. Is there something wrong with the battery or is this just the way the nexus 4 operates?
Sent from my Nexus 4 using xda app-developers app

funkymonkey_01 said:
Hi I'm new to nexus 4 and have a battery question. I didn't want to start a new thread. I bought a slightly used nexus 4 and charge it to 100% after only a minute of use it immediately starts to drop. Is this normal? I ask because I had an HTC sensation that I charged to 100% and could at least get 10 minutes of use before battery started to drop. Is there something wrong with the battery or is this just the way the nexus 4 operates?
Sent from my Nexus 4 using xda app-developers app
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Click to collapse
Nexus 4 works this way.. Its all right if battery drops in a minute.. There are plenty of process and their corresponding syncs that actually causes the battery to drain.. Try some different kernel all are good you will get more battery backup.:good:
BUT Stock Rom + Stock kernel are THE BEST.

Maintaining battery health requires a bit of a balance. You don't want to frequently do deep discharges, but you also don't want to charge your phone every time it drops by 10%. If you're sitting around with a charger, plug your phone in when it hits 50%, then let it charge fully before unplugging it.
Overall though, batteries just degrade. You're not going to have a huge impact on the health of your battery unless you're charging it every time it hits 95%.

How about using a slower charger over night? I believe the OEM is what, 1.2amps? I have a couple 1amp chargers from previous phones I had. Will that charge slower/safer?
Sent from my NeXus 4®

Modern lithium ion batteries are fairly robust and more chemically sound than early rechargeable batteries. However they do have a finite number of charge cycles.
But you have to understand what a charge cycle is, a full drain to 0 and charge to 100.
So for example Draining to 50 then up, then 50 again then up= 1 charge cycle.
So... Draining it to 95 and bumping it to 100 would take 20 times to reach 1 charge cycle.
Trickle charging vs the oem power used isn't going to make much difference either.
Being ocd about the battery is just going to make you pay more attention to it and thus making you more aware of drain...just use the darn phone and enjoy it!

studacris said:
Modern lithium ion batteries are fairly robust and more chemically sound than early rechargeable batteries. However they do have a finite number of charge cycles.
But you have to understand what a charge cycle is, a full drain to 0 and charge to 100.
So for example Draining to 50 then up, then 50 again then up= 1 charge cycle.
So... Draining it to 95 and bumping it to 100 would take 20 times to reach 1 charge cycle.
Trickle charging vs the oem power used isn't going to make much difference either.
Being ocd about the battery is just going to make you pay more attention to it and thus making you more aware of drain...just use the darn phone and enjoy it!
Click to expand...
Click to collapse
Word.
Sent from my NeXus 4®

there is no right way. plug it in when you need a charge, or when there is just a plug around and you want to top off. you do not need to discharge battery to a certain point then charge. just charge it whenever. all these other theories are just that, theories. at work all day, i bump charge it whenever i reach around 80-85%. my battery has not gotten worse. and when im not around chargers, my battery is built to last. i average around 5.5-7.5 hours screen on time, depending what im doing, and im a heavy user.
---------- Post added at 01:30 PM ---------- Previous post was at 01:30 PM ----------
studacris said:
Modern lithium ion batteries are fairly robust and more chemically sound than early rechargeable batteries. However they do have a finite number of charge cycles.
But you have to understand what a charge cycle is, a full drain to 0 and charge to 100.
So for example Draining to 50 then up, then 50 again then up= 1 charge cycle.
So... Draining it to 95 and bumping it to 100 would take 20 times to reach 1 charge cycle.
Trickle charging vs the oem power used isn't going to make much difference either.
Being ocd about the battery is just going to make you pay more attention to it and thus making you more aware of drain...just use the darn phone and enjoy it!
Click to expand...
Click to collapse
truth.

The battery will only be able to take 1.2 amps or what ever, for the first 10% or so of battery life. By 25% charge, its only sucking around 750ma, and by 50% you are lucky to suck a half amp. Lion batteries do not charge via constant current, they charge via constant voltage (with the voltage dropped for 25% battery charge or less due to over current). So as the battery charges (aka increases in voltage) it draws less and less current.
You want a tip from a guy that has to run the lion battery analyzer for flight modules, keep your battery between 15% and 85%, and long term story them around 30%-40%. A pack that is left on a good charger ($75 or more) charger and never gets below 98% will loose its capacity at double the rate of a pack that floats above 15% and only gets charged to full when needed.
Ive had packs in the field coming back for recal from 2003 still holding above 90% rated capacity because they dont leave them on the charger and dont let them go dead in a locker some where. On the other side ive had 2 year old packs come back that are at 80% capacity ( i fail them at 85%) or less because they sat dead for a year.

Advantage to charging phone to full before first power up?

Hello!
As the thread title states, I heard that charging the phone when it's powered off to a full charge is more beneficial to the phones battery, before I turn it on for the first time.
Is there any truth to this rumour? Or am I just fine to turn on the phone and charge it from whatever percentage the battery is at out of the box?
Thanks!
Sent from my SAMSUNG-SGH-T989 using XDA Premium 4 mobile app

As I understand it, all the batteries are charged before being shipped anyway. That is as good as / counts as the first charge. You should be able to use it at will.
Generally I start playing. After the first 3 or 4 full charge cycles it gets to the optimum in my experience, but that may be the phone calibrating itself.
---------- Post added at 12:28 PM ---------- Previous post was at 12:25 PM ----------
One thing that I do believe makes a difference to battery life is a slow charge. I keep my Note 3 on charge at night using my Note 1 charger, and it is taking about 6 hours to fully charge. I am not certain this is 'better' than a fast charge, but it seems logical that the battery could last longer (more cycles). Does anyone know (not guessing, like me)?

jeromepearce said:
As I understand it, all the batteries are charged before being shipped anyway. That is as good as / counts as the first charge. You should be able to use it at will.
Generally I start playing. After the first 3 or 4 full charge cycles it gets to the optimum in my experience, but that may be the phone calibrating itself.
---------- Post added at 12:28 PM ---------- Previous post was at 12:25 PM ----------
One thing that I do believe makes a difference to battery life is a slow charge. I keep my Note 3 on charge at night using my Note 1 charger, and it is taking about 6 hours to fully charge. I am not certain this is 'better' than a fast charge, but it seems logical that the battery could last longer (more cycles). Does anyone know (not guessing, like me)?
Click to expand...
Click to collapse
I thought that they only charged the batteries to ~50% or so, but I don't know for sure.

skadude66 said:
I thought that they only charged the batteries to ~50% or so, but I don't know for sure.
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Click to collapse
Yes, but that is enough.
This thread will no doubt attract the usual plethora of wild theories. From everything I have read (sometimes from actual engineers), there is little or no truth to any of them. Just use it, charge it before it is empty (typically before it hits 10%, but the higher the better), and use it etc.
The only reason any full charge/discharge cycle may appear to help is that the phone calibrates itself to this battery. That can make it 'last' longer in the stats, but in reality it will not run out any slower.

You only need to cycle the battery if you're having problems with the calibration. (ie. It keeps turning off at 20%)
Cycling the battery to make the charge last longer is a placebo.
Phones are charged to +-30% before shipping. This so the device can be tested before shipment, and by the customer in the shop.
Best is to keep it between 90 and 10%, though in overall run the difference is that your battery lasts about 4 weeks longer before you have to replace it.
The advantage to charging to full: You can play with it longer on your first run.
The disadvantage: You have to wait 90 minutes before you can play with it.
That's it.
The old 'drain and fill' principle does not apply to Lithium-Ion.
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk

For those who wants some reading:
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
Basically what ShadowLea said... High voltages, and low voltages stresses the battery, shortening its lifespan.

ShadowLea said:
You only need to cycle the battery if you're having problems with the calibration. (ie. It keeps turning off at 20%)
Cycling the battery to make the charge last longer is a placebo.
Phones are charged to +-30% before shipping. This so the device can be tested before shipment, and by the customer in the shop.
Best is to keep it between 90 and 10%, though in overall run the difference is that your battery lasts about 4 weeks longer before you have to replace it.
The advantage to charging to full: You can play with it longer on your first run.
The disadvantage: You have to wait 90 minutes before you can play with it.
That's it.
The old 'drain and fill' principle does not apply to Lithium-Ion.
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk
Click to expand...
Click to collapse
Perfect! I knew I had read somewhere (I think from XDA dev shen_ye) that you should keep it between 90 and 10!
Does it really only take 90min for a full charge?! I knew it would charge faster but that's really fast
Sent from my SAMSUNG-SGH-T989 using XDA Premium 4 mobile app

skadude66 said:
Perfect! I knew I had read somewhere (I think from XDA dev shen_ye) that you should keep it between 90 and 10!
Does it really only take 90min for a full charge?! I knew it would charge faster but that's really fast
Sent from my SAMSUNG-SGH-T989 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
With the original charger it's a little under 2 hours for 0-100%. So from 30%, about 90 minutes.
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk

ShadowLea said:
With the original charger it's a little under 2 hours for 0-100%. So from 30%, about 90 minutes.
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk
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Click to collapse
Woo! Thanks! That'll give me plenty of time to start transferring over my old stuff to my new SD Card

Fast Charging Issue

Yesterday I have my curiousity and uncheck the fast charging option on settings. I turn off my note 4 and start my charging. I started to charge at 18% and after an hour it go up to 23% which is annoying. I decided to turn on my device and tick the check box of fast charging option. I left my device for 2 hours but to my surprise it was only at 54%! (device off). I turn on again my device to check if the fast charging is activated and found out that it was checked. I left it again for 2 hours and still 72%. Anyone experienced this? Any advice? It will be so much appreciated. TIA.

Something was probably running in background. Restart your phone and try again.
Sent from my SM-N910T using XDA Free mobile app

Have you tried with other usb cable ?
Maybe your cable is the problem.
If after change cable still didn't work, bring your device and the adapter that come with to to service center to check where the problem is

Did you use original charger and original cable?

I don't think fast charge works with the phone off...

rexxar31 said:
Yesterday I have my curiousity and uncheck the fast charging option on settings. I turn off my note 4 and start my charging. I started to charge at 18% and after an hour it go up to 23% which is annoying. I decided to turn on my device and tick the check box of fast charging option. I left my device for 2 hours but to my surprise it was only at 54%! (device off). I turn on again my device to check if the fast charging is activated and found out that it was checked. I left it again for 2 hours and still 72%. Anyone experienced this? Any advice? It will be so much appreciated. TIA.
Click to expand...
Click to collapse
Make sure you are using the original charger and cable from Samsung. Otherwise it could be the chargers problem as it doesn't provide enough voltage.

I had this same issue.i have changed cable ,even charger. You can only replace battery.Today 100% in 1h 28min before 100% in about 3.5h

pedmond said:
I don't think fast charge works with the phone off...
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Click to collapse
This would make sense, right?
I usually get to 50% in 30 minutes and 100% in 90 minutes with the phone on.
Sent from my SM-N9100

i never face this issue at all

I get 100 charge at 2 hours is it normal?

Send from my note 4

Hey hi I am from India and I had same issues. ..I went to service centre and found out that it was adapter issue. .since I am in warranty they replaced it and it works like charm. .no issues

fast charging wont active if your device is off. it's a application so you need to turn ON ur phone to active the fast charging. tried it already. it takes 8hrs to full charge [ off device ]

Iyrah said:
I get 100 charge at 2 hours is it normal?
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Click to collapse
That is not normal if you are using the original Samsung charger and cable? Did you turn fast charging on with Power Saving Mode? But sometimes the plugging source might not be able to provide enough voltage. I got 50% for 30 minutes and 100% for 60 minutes.

cwk8412 said:
I got 50% for 30 minutes and 100% for 60 minutes.
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Click to collapse
No, you did not. See post #17 below.
---------- Post added at 09:48 AM ---------- Previous post was at 09:47 AM ----------
jebjebs said:
it takes 8hrs to full charge [ off device ]
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Click to collapse
No, it does not. In "normal mode", our power supply provides about 2 A of charging current. Taken losses by generated heat and less current needed for charging the last few percents into account, it takes about 2 hours or a little more for a full charge while the Note 4 is switched off. NOT 8 hours.
8 hours is a realistic value if you use a low power current source, like a standard USB port providing 500 mA of current.
500 x 8 = 4000 mAh; and that's quite exactly the amount you need to push into the battery to achieve a 100 % charge.
So your 8 hours refer to charging with a low power device like a standard USB port, but not to charging using the original power supply AND (!) the original cable. Yes, the cable DOES make a difference.
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Iyrah said:
I get 100 charge at 2 hours is it normal?
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Yes, it is.

Chefproll said:
No, you did not.
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No, it does not.
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Yes, it is.
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Im pretty sure I did

cwk8412 said:
Im pretty sure I did
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You cannot.
It's physically impossible.
I got 50% for 30 minutes and 100% for 60 minutes.
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Not all energy goes into charging the battery; there's a good deal wasted for generating heat; that's why your Note gets a little warm while charging.
Fast charging provides a charging current UP TO about 3000 mA, that's the safety limit. Our battery has about 3220 mAh capacity.
The charger provides that current till the battery is "almost full", that's at about 92 %. ("About", because it's not the same every time, depends on several factors.)
After that, the current is lowered, so charging from e. g. 92 % to 100 % takes considerably more time.
So even if you get about 50 % in 30 minutes, a full charge to 100 % takes far more time than 60 minutes - because the "last mile" takes far more time than charging up to e. g. 92 %.
A continuous fast charge of 3000 mA up to 100 % will kill your battery.
As said, there's heat generated while charging. That heat does not fill the battery, so we need to deduct the energy wasted that way.
That's why it takes about 90 minutes for a full charge. Could take more time according to the battery drain of apps and processes running while charging. So fast charging times of 90 to 120 minutes or so are just plain normal.
And that's why it's simply impossible to charge the battery up to 100 % in 60 minutes.
I know it's tempting just to multiply the time taken for a 50 % charge by 2 - but that's not what's happening in reality.

cwk8412 said:
That is not normal if you are using the original Samsung charger and cable? Did you turn fast charging on with Power Saving Mode? But sometimes the plugging source might not be able to provide enough voltage. I got 50% for 30 minutes and 100% for 60 minutes.
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yup thats about right. [email protected]=12236mWh
30 min at 9V/1.8A= 8100mWh
30 min at 5V/2A=5000mWh
12236-(8100+5000)=full charge + 864mW of heat.
dont listen to chefprol - he knows nothing about electronics or batteries.

zurkx said:
yup thats about right. [email protected]=12236mWh
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Ah, my highly clever friend.
Obviously, you didn't learn from two painful and embarrassing confrontations. So get ready for the third.
30 min at 9V/1.8A= 8100mWh
30 min at 5V/2A=5000mWh
12236-(8100+5000)=full charge + 864mW of heat.
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In Germany, we have a special term for things like that; it's called a "Milchmädchenrechnung". Translation would read like "a naive calculation made by ignoring vital facts".
There's a lot of vital facts you ignored. Shall I start with you claiming that 14 hours is the best charging time ever? Or with you claiming that Lithium Ion batteries use "trickle charge" ?
See http://forum.xda-developers.com/note-4/help/note-4-question-charge-t2989546 for the full coverage; enjoy.
Now let's concentrate on the Milchmädchenrechnung above.
First have a look at this - I guess we can take Anandtech for quite serious: http://www.anandtech.com/show/8613/the-samsung-galaxy-note-4-review/3
Further down the page, under "Charge time", you'll find this statement about the Note 4: "... and most of the benefit would come from the first 50% or so of charging as power drops rapidly as the battery approaches full charge."
The red part is the part you didn't understand, leading to your Milchmädchenrechnung.
You took for granted that the power (amperage) doesn't drop at the end of the charging process; I guess you simply didn't know.
And that's the important factor making a full charge in just 60 minutes completely impossible.
Did you really believe Samsung would miss the chance of presenting a sensation like that in all media you can think of ? - That would have been the fastest charging mobile phone ever known. CNN would have broadcasted a special feature about that.
They did not, Samsung did not.
Reason: It's just nonsense.
dont listen to chefprol - he knows nothing about electronics or batteries.
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I guess I don't need to comment on that.

14 hours was the time i recommended a NEW phone be charged for the FIRST charge. i normally charge mine for about 7 hours with a single coil Qi charger. Because it takes around 7 hours (5 for a 3 coil depending on power input) for a Qi charger to go 0-100.
lithium ion batteries do use trickle charge. they top up the battery if the phone is above 90% at a slow charge rate. hence "trickle".
No i did take into account that power drops at the end of the charging process. thats what the extra 864mW is there for. Thats waste heat+headroom. maybe you can show YOUR calculations which are not so naive. oh wait, you cant. because a simple wall clock will tell you that the note 4 will quick charge in an hour in regular use.