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S2 charging time - why so slow?

Everybody knows first smartwatch problem is battery. Having to charge it daily is like a nightmare.
But there is anything still worst? Yes, if you have the S2 you know it: the ****ing slow charge!
I am still surprised, and cannot undertand, how can it be. Ig the battery capacity is less than 300mah, and the charger is 700mah/h, why it takes so long to get it charged?
I think Samsung had a big error in this issue.
My previous Pebble Time battery lasts for 5/6 days, and what was still better is that in 30 minutes you have battery full.
You can fail in one of the two factors (battery duration or time to charge), but not in both. And Samsung did it.

Mine takes ~ 2hrs to full charge.
Agree, too slow.

I shut down the watch for faster recharge, but haven't used a stopwatch so far. I have to reload every second night and i am fine with it

Mine charges pretty fast, less than a hour and it is full. But another thing you have to look at is this is wireless charging which charges slower than regular charging. No gold contact points or anything. FYI I have the 3g version, don't know if that makes a difference or not.
Sent from my SM-N920T using Tapatalk

Mine takes around 2 hours too. It's true that QI normally is slower than cable, but it depends also in the power of the chargues. Normal QI chargers are 1000mah and they charge batteries 10x bigger en same time... and s2 charger is less than half the power!
So the problem is not the charger...
Enviado desde mi SM-G928F mediante Tapatalk

Sure you can apply a higher current to charge, but most battery with that size just cannot affort that high current and will die very soon, so many will limit the current. There exist small battery can recharge at high current, just not many using it.

rodalfa said:
My previous Pebble Time battery lasts for 5/6 days, and what was still better is that in 30 minutes you have battery full.
You can fail in one of the two factors (battery duration or time to charge), but not in both. And Samsung did it.
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Pebble Time battery size is only 150mah and charges via a wired connection. No one is failing anything.

Wireless charging has losses maybe around 30-50%. So that 700mA of input from the charger will only give around 350-490mA of output. Plus the fact that we charge it while the watch is powered on will also be another factor to slow down the charging.
Also, pebble doesn't give you plenty of options to do so lesser user interface means lesser battery drainage, not like with the s2, you can do plenty of stuff which will result in you always touching and using the watch.
As for me, i've personally tested the watch. At minimal usage (maybe just the same usage I do when I was using a pebble) i got 5 straight days without charging. And I fully charge it at 1.5 to 2hrs.
Ps. Sorry for bad english.
Sent from my SM-G928F using Tapatalk

2hrs here. Make sure you use the supplied cable, I find if I use my s6 one with my Gear or Tab S it is slower ...

Lancerz said:
FYI I have the 3g version, don't know if that makes a difference or not.
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It may. The 3G version uses a Qualcomm SoC and it may support QuickCharge. I haven't timed my 3G but I'd guess it charges in an hour-ish. I also keep it off when charging.

charging - amperage/current quickly drops to ~440mA regardless of battery %

in the last week my battery no longer "quick charges". i have 'Ampere' installed so i'm used too seeing it charge at around 2800mA. i vaguely understand that phones charge quicker up to around 80% and then at a slower rate for the remaining - it's not this.
when I plug in the, current starts at ~1300mA and climbs to just under 3000mA... and drops to ~440mA in a minute or so.
it doesn't appear to be the cable and/or charging block that came with the phone - using a 1A charger from my last phone gets similar results and i purchased a new cable that's compatible with high speed charging.
i really wanted to love this phone.

I have a Samsung quick Charger from a Note5, and it has never quick charged my PureXL (actually super slow charges it,) but after the last update, I noticed I got an overvoltage error using it....

The reason is that this phone is not quick charge enabled. That's actually something that needs to be built into the SoC + Kernel support. You have a solid 2A charger, it'll go fast, but it can't rapid draw like say, the premium motos or a OnePlus.

TheLastCanadian said:
The reason is that this phone is not quick charge enabled. That's actually something that needs to be built into the SoC + Kernel support. You have a solid 2A charger, it'll go fast, but it can't rapid draw like say, the premium motos or a OnePlus.
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sorry, i don't think i explained myself that well. i'm pretty sure that i've noticed a change in performance. when the phone was new i remember the current being high when battery % was lower, and then decreasing as it charged.
in the last week or so it seems to be charging at a slower rate and with the original 2A charger and cable. if the battery is at 20% the current will increase quickly to something above 2800mA and then immediately decrease so that by the time it's at say 22% charged the current is at a steady 440mA.
oh! ****. i didn't realize that 'quick charge' was actually 'Quick Charge™ by Qualcomm®'.. nice and generic sounding.

my pure xl was doing a full charge in less than 3 hours. as of last week all of a sudden it takes 10 hours to fully charge. using original charger and cable. can anyone shed a light on fixing this problem?

thvpk said:
my pure xl was doing a full charge in less than 3 hours. as of last week all of a sudden it takes 10 hours to fully charge. using original charger and cable. can anyone shed a light on fixing this problem?
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My Nexus 6p is now facing the same problem as yours. It charges less than 3 hours before and all of a sudden two days ago, it has taken 10 hours to fully charge. With all cables and charges faults ruled out, my only guess is the fault lies in the phone. I don't think it is the USB port either. I believe it may be something to do with the software I cannot comprehend. But I currently don't have the time to reflash my ROM. This Resurrection remix ROM served well for the past year.
Currently, my amperage averages out to 350 mA. Sad. I wish someone with knowledge about this can reply to this thread. It seems this question has been lingering here for more than two years already. Are we the only ones who face this problem?

How and where do you charge your Mate 9 now with supercharge?

So now that Mate 9 and most android flagship phones have quick/super charge, I am curious to see how others charging procedures have changed, if any.
Here is how I charge my phones. Use it throughout the day/day, and before going to bed, let it charge over night. Wake up and my phone is at 100%, use throughout the day. Repeat procedure.
Now with supercharge, do you find yourself charging it before going to bed, then once it gets to a reasonable charge %, turn it off during the night. Or do you charge it during the morning before going to work. Does not seem ideal to let it charge over night with supercharge as I have read that could dimish the battery life later on. Charge it at home or at work?
Granted that I have yet to have the Mate 9, but plan to get it soon. Just curious as to how others charge their phones using the supercharge.
Thank you for your feedback

Charging habit hasn't changed; I always charge my phones throughout the night no matter what. Doesn't hurt the battery so I don't worry about it.

Mine changed. I used to charge my iPhone 6s overnight but after getting mate 9 I charge it only in the morning. I do a quick charge after coming from office and around an hour in the morning while getting ready.

I charge my phone overnight with an older (a bit slower) charger, having my supercharger handy in case of emergency. I don't think it's necessary but it make me feel better.
Sent from my MHA-L29 using XDA-Developers Legacy app

I have changed to now just charge the phone when it gets below 20% and doing it this way to keep a full charging cycle between charges as much as possible. With the fast charge now it only takes a bit more than 2 hours to complete a charge cycle,so this can be done any time of a day with no problems. Just make sure there is a charger at hand is the most important.

I usually charge mine overnight, and for that I use a slow charger as I suspect the battery might be degraded by repeated use of the fast charger. I have no proof of that of course.
I'll use the fast charger if I need to give it a boost before travelling.

RR-99 said:
I usually charge mine overnight, and for that I use a slow charger as I suspect the battery might be degraded by repeated use of the fast charger. I have no proof of that of course.
I'll use the fast charger if I need to give it a boost before travelling.
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As far as I've read these batteries don't degrade. The older ones did. People are still thinking that these batteries act in the same way.as the older ones and they don't. Those are the facts as I know them.

bossei said:
As far as I've read these batteries don't degrade. The older ones did. People are still thinking that these batteries act in the same way.as the older ones and they don't. Those are the facts as I know them.
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All batteries degrade, no way around it. They just don't degrade as fast as the ancient Nickel Cadmium ones did.
Sent from my MHA-L29 using XDA Labs

Is it okay to charge overnight ?

Hello guys sorry if it is an innapropriate question but I want to know if it is okay to charge my s8+ over night.. does it damages the phone battery or not ? Thanks

I wouldnt. Doubt it would but would but i find it pointless. It charges pretty quick and wouldnt want to leave it charging for 5+hrs The battery is superb i would quick charge a few mins before bed. Ive gone to bed with 19% and had 17% when i woke the next morning.

ssgunner20 said:
I wouldnt. Doubt it would but would but i find it pointless. It charges pretty quick and wouldnt want to leave it charging for 5+hrs The battery is superb i would quick charge a few mins before bed. Ive gone to bed with 19% and had 17% when i woke the next morning.
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Yeah I know but i work in the morning at 7 thats why . I use it at night leave it at about 10%

Been doing that with my phones for years, haven't had a problem yet.
technically with Lith Ion the less you let it die all the way the better it is for the battery.

albaniandroid said:
Yeah I know but i work in the morning at 7 thats why . I use it at night leave it at about 10%
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It's not going to outright destroy the battery, but definitely better not to keep it on the charger. I cannot speak to your schedule and work environment. I charge mine mid day at work. If your usage is generally the same on a daily basis, just find a spot where you can squeeze in a charge or two during the day.

Always changed overnight for ever I can Remeber. Never faced any issues.
Sent from my SM-G955W using Tapatalk

i leave the phone on the wireless charger. it better for the battery or is the same?

let me clear it..
1st of all in modern battry charging technology overnight charging doesnt harm battery at all as lith ion batt never get overcharged..bcoz once its 100%(max threshold) charging stop and phone use batt powr
after that once it get around 100% ( lower threshold) it start charging again...
STILL I PERSONAL ADVICE TO CHARGE OVERNIGHT WITH FASTCHARGING MODE OFF(((OFFF)).
Sent from my SM-G955U using Tapatalk

lipon625 said:
i leave the phone on the wireless charger. it better for the battery or is the same?
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As far as I know, technically wireless chargers are worse for the battery than a wired. They produce more heat, which technically will have a larger impact on the battery. That being said, I doubt there is any appreciable difference.

xenx said:
As far as I know, technically wireless chargers are worse for the battery than a wired. They produce more heat, which technically will have a larger impact on the battery. That being said, I doubt there is any appreciable difference.
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Good point. Does ths fan cooler on the wireless one prevent as much heat?

The battery retains 95% battery life after a year of normal charging, I wouldn't worry about depreciation. Relax and enjoy the phone

No, you can charge your android overnight as they are smart enough

Boooom! Lol.....just kidding I hope

Stick with the samsung fast charger. I have a lot of other ones, and only the samsung stay cool (fan) and doesn't cycle like the cheap ones do.

Yes, as most have said, you can charge overnight. I have done this every single night for years, on all my flagship devices. Smartphone batteries have technology in them to stop charging when they hit 200% and only trickle charge them. It won't do any damage or won't cause long term battery life issues.
Just turn off fast charge if you're going to charge overnight.

ssgunner20 said:
Good point. Does ths fan cooler on the wireless one prevent as much heat?
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I have the new Samsung wireless fast charger and I'd say it's just a tad warm kinda like the USB-C charging
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xenx said:
As far as I know, technically wireless chargers are worse for the battery than a wired. They produce more heat, which technically will have a larger impact on the battery. That being said, I doubt there is any appreciable difference.
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I've also heard the opposite, as wireless chargers charge slower they put less pressure on the battery which helps it not degrade as fast. How much difference it would make either way I dont know, possibly hardly any.
I do know keeping it between 40-80 is widely regarded as being a lot better for li-ion battery degradation than going to 100% all the time or running it really low. Accubattery for example will say you used about 0.2 battery cycles going from 35% to 80%, but 0.92 battery cycles going from 55% to maximum. They are probably just using that 40-80 rule to work it out, but assuming it is correct, you can see how much effect it has, being nearly 5x more battery cycles despite both being around a 50% charge up.
So charging it overnight will get it to maximum, which isn't great in terms of battery cycles. I have seen a couple of battery apps that I think can manage charging so that it notifies you at 80% to unplug it, but I don't think they can actually stop the charge at 80% if you leave it plugged in (althought I might be wrong on that). Again how much real difference it will make I don't really know, and it probably depends how long you plan on keeping the phone, 1 year then it shouldn't be too much of an issue, 2 years or more and I would probably at least try to keep it between 40-80% when possible.

Ha,
Been charging all my phones overnight.
Been using wireless charging since the note 3 and always please it on the charger when im next to it and not using my phone.
Never had a battery problem

Thanks everyone for their answers ..*let the overnight charging begin*

I used Ampere to check how much current was going to my phone when it was fully charged and it read 0.0 so I believe the phone cuts off the charging function when fully charged. As even on 100% without the "fully charged" portion on, it will still show trickling voltage.
Hope this helps. I also advise turning fast charging off at night just to be safe.

Best battery life tip: don't use the turbo charger!

So, I own this phone for a few weeks now and I got pretty frustrated about the battery life on this phone as I was getting 3 hrs of SOT a best.
Then I decided not to stress the battery so much by charging it with the included turbopower 25 charger all the time, and use my old (5V 2.1A) charger overnight instead. Then I was surprised to see my SOT going up to about 4.5-5hrs.
I did some research about fast charging techonlogy and found out that when you fast charge you typically don't get as much charge into a battery as with a slow charge.
I still use the turbo charger when I am short on time, but using my regular one definetely does add more juice to the battery, thus, helping it last throughout the day.

sleepdownloader said:
So, I own this phone for a few weeks now and I got pretty frustrated about the battery life on this phone as I was getting 3 hrs of SOT a best.
Then I decided not to stress the battery so much by charging it with the included turbopower 25 charger all the time, and use my old (5V 2.1A) charger overnight instead. Then I was surprised to see my SOT going up to about 4.5-5hrs.
I did some research about fast charging techonlogy and found out that when you fast charge you typically don't get as much charge into a battery as with a slow charge.
I still use the turbo charger when I am short on time, but using my regular one definetely does add more juice to the battery, thus, helping it last throughout the day.
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Will definitely try that out. Cuz my usage gets me around 4 -4.5 or even 6 if I read a little. So if this happens for me too I'm gonna get some nice battery life.

Curlyfry2121 said:
Will definitely try that out. Cuz my usage gets me around 4 -4.5 or even 6 if I read a little. So if this happens for me too I'm gonna get some nice battery life.
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Please do report

It doesn't really matter, at least not that significantly... something else is the cause.
Using a turbo charger could change the longevity of the battery, over time, due to heat buildup and breakdown of the internal components due to more stress, but it wouldn't just "get better" switching to standard charger... I charge my phone half the week on a standard charger when at home, and when traveling I use a quick charger. If I am on either at home or on the road for a few weeks at a time and my battery life doesn't change. Well, not because of the charger, but at home I am within 30' of a very high quality WiFi router all the time and essentially never on mobile data, on the road it's the complete opposite.
If you did your researching into Qualcomm's Quick Charge 2.0 (and higher) standards you would see that the issue of batteries not getting a full charge from the original QuickCharge/Fast Charge standard has been remedied with high voltage charging automatically downgraded to "standard" voltage charging during about the last 10% of the charge cycle to allow the battery to cool and take a full charge.
Not doubting your getting better SOT, just your analysis of the reason why are...

acejavelin said:
It doesn't really matter, at least not that significantly... something else is the cause.
Using a turbo charger could change the longevity of the battery, over time, due to heat buildup and breakdown of the internal components due to more stress, but it wouldn't just "get better" switching to standard charger... I charge my phone half the week on a standard charger when at home, and when traveling I use a quick charger. If I am on either at home or on the road for a few weeks at a time and my battery life doesn't change. Well, not because of the charger, but at home I am within 30' of a very high quality WiFi router all the time and essentially never on mobile data, on the road it's the complete opposite.
If you did your researching into Qualcomm's Quick Charge 2.0 (and higher) standards you would see that the issue of batteries not getting a full charge from the original QuickCharge/Fast Charge standard has been remedied with high voltage charging automatically downgraded to "standard" voltage charging during about the last 10% of the charge cycle to allow the battery to cool and take a full charge.
Not doubting your getting better SOT, just your analysis of the reason why are...
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Maybe you're right, I'm still monitoring my battery life on both chargers, and with the same usage, my battery does last longer when charging with the regular 5V one. I'm mostly on 3G network data and rarely use wifi, as I'm mostly only sleeping or eating at home. Maybe there are other factors making this difference, though i'm pretty sure the charger is the only difference for me. Will report if I notice anything else.

I don't see any big difference, I'm also using standard charger over night and quick when I'm in the hurry. Despite charging methods my sot time is very inconsistant from 2,5h to 4h at best.