Develop Bugs

Evo Charging Times

Can you help me out here? I'm a new Evo owner, but I have a background in electronics which spans nearly 50 years and a fairly comprehensive "technical" knowledge of lithium polymer batteries, chargers, and battery management protocols.
And I want to understand the issues that so many of you are experiencing with your Evo batteries. Why? Because I'm experiencing some of 'em too and if I understand what's happening I might be able to offer solutions. I already have a couple of theories and I even have some ideas for workarounds, but I'm missing a few pieces of the puzzle which I'm hoping you can help me find.
What I'd like to know is how long does it take you to recharge a dead or nearly depleted battery in your Evo. For this information to be useful I'll also need to know the size of the battery (in mAh) and the output of the charger (in mA).
Please note that I'm just as interested in how long it takes to charge a stock battery as I am in how long it takes to charge an extended battery. Likewise for wimpy chargers and high-output chargers. The more diverse the data is the more useful it will be.
So there you have it. Can you help me out? I'll be sharing my conclusions so you might be helping yourself too.
Pete

Reserved for data summary

2 hrs and 20 minutes roughly from dead to full. Stock battery, stock charging cable and adapter.

same, 2 hr 20 min dead to full 1500mAh charging at 1A. i average about 30hrs battery life.
Sent from my PC36100 using XDA App

Interesting. In round figures a 2:20 (2.3hr) charge time for a 1500mAh battery indicates a ~650mA charge rate. This suggests that HTC has built a ~650mA charging current regulator into the Evo because a 1000mA (1A) charge rate would charge a 1500mAh battery in a little over 1.5hr.
The regulated charge rate isn't at all surprising. In fact, it's standard practice in consumer electronics devices. Most LiPo cells can safely be charged at 1C, which would be 1500mA (1.5A) for a 1500mAh battery, but they can react explosively when pushed harder. The folks who engineer consumer electronics also tend to stay well below maximum rates because they need to assume (among other things) that some people will continue to use batteries that are worn out or damaged and really should be replaced.
My primary reason for posting this thread and asking this question is to get enough evidence to determine whether the Evo could be charged faster with more powerful chargers, and the answer seems to be no. It can obviously be charged slower if someone uses a charger with an output below 650mA, but I'd be surprised if it could be charged any faster with a more powerful charger.
And FWIW, a dead 3500mAh battery would take about 5.4hrs to charge at a 650mA charge rate. My guess is this is even how long it will take in Seidio's external charger because the engineers would have to assume that people will also be charging OEM batteries in them.
But this is all assumption based on common engineering practices and 2 reports (so far). I'd sure like to have some more data to work with; especially data for different chargers and battery capacities. Another question I'd like to answer is whether the Evo has a mAh cap or a time limit on a charge cycle. The mAh cap could be tough, but a time limit might be pretty easy to work around.
I suppose I should add one more thing: My job as a maintenance supervisor for a pharmaceutical manufacturing and analytical lab requires that I'm reachable by phone at all times, so the experimentation I can do with my own phone is pretty limited. For example, I can't turn it off to charge the battery and I feel real uneasy about running the battery dead for testing purposes. My phone use habits seem to be served pretty well by the 1500mAh OEM battery but I'd like to have the reserve of an extended battery.
But not at the expense of having to remove the battery from the phone to charge it. That's a deal-breaker for me.
The bottom line is: Please keep posting your charge times and don't forget to include the output of the charger and the mAh rating of the battery. In return, I'll share any conclusions I come to so we can discuss them and possibly come up with a workable solution.
Pete

I'm draining my Sprint OEM extended battery (2600 mAh) and will post the results.

sk63 said:
I'm draining my Sprint OEM extended battery (2600 mAh) and will post the results.
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Click to collapse
That will be an interesting comparison.
If my calculation of a 650mAh charge rate is correct then it should take a little over 4 hours to charge, but that could be affected by whether the phone is on or off and what processes and apps are running if it's on.
I'm particularly interested in whether it will fully-charge or whether a mAh or time limit will interrupt the charge cycle before that happens.
Pete

It finally died and I started charging it at 12:25 without turning it back on. Using the stock AC charger.
Anecdotally, I use the Current Widget and when charging it hovers around 650mAh. And when discharging it's usually under 400mAh and with the screen off, well under 100mAh.
I believe the widget monitors the current in/out of the battery and that while charging, the current needed to run the phone bypasses the battery directly so the widget doesn't register it. Though I would need a multimeter to confirm.
I've also got the stock battery I'm draining using a Hero. After the extended finishes charging them I'll swap and charge while the phone is on and compare the rate.
EDIT: Extended took almost exactly 4 hours charge. Now testing the charge rate of the stock battery with the phone on.

Glad to see someone doing this, as a lot of different information is posted on this board about batteries and charging.
I just wanted to add that when looking at current widget logs, the charging rate does seem to change depending on the battery life, as you get close to full the charging rate does seem to gradually decrease until it is quite low, at least according to current widget. I have seen other users say that it is only the last ten percent that the phone does this, but I can't be too sure as using my phone usually interrupts the log and such.
At least the current widget logs give some indication of the charging rate changing under different conditions, if not at least the phone using more or less current for these conditions.

sk63 said:
Anecdotally, I use the Current Widget and when charging it hovers around 650mAh.
~~~ snippo ~~~
EDIT: Extended took almost exactly 4 hours charge.
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Boy, I hit those two nails right on the head didn't I? That's the nice thing about electricity: It can easily be predicted with mathematics.
I'll be looking as soon as I post this, but where does one find this "current widget" and does it run on a non-rooted phone?
And sk63: Almost exactly? Thanks for the info!
Pete

PGRtoo said:
And sk63: Almost exactly? Thanks for the info!
Pete
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Click to collapse
It was like 4 hours +/- 5 minutes missed the exact moment when the light when green.
Stock battery with phone turned on took close to four hours as well. Phone usage didn't seem particularly high, maybe there was an issue in swapping the batteries.

So I'm guessing the 800 ma aftermarket charging cable I bought would be sufficient?
** As a sidenote, I wonder if this 650 ma limitation is hardware or software enforced? If software enforced, could we turn it off to hit closer to 1 amp? Couldn't a developer write an app to fix this? If not an app, perhaps a kernel?
This is kind of like a CPU being rated at 3.0 Ghz when it can safely run at 3.8 Ghz by people that know what they are doing. The 650 ma limitation is just "idiot" proofing.

If current widget is accurate, when charging I've seen my log read up to 900mah, I always figured this was how much current going into the battery. The more I use the phone the lower it goes.
Sent from my PC36100 using Tapatalk

2:20 hours for a full charge? Dang, it only takes me about 1:27 to charge my dead battery to 100% with the phone on, stock battery.

Are you asking about higher mA chargers for the purpose of charging the stock OEM battery faster, or for being able to simply charge a higher capacity battery?
Does charging the battery faster have any negative or positive affects on the battery or battery life? Because I seem to remember posts talking about the differences between charger the evo with a stock battery from the wall charger vs charger from a usb on a computer. The wall charger would charge the battery much faster, but seemed to drain faster also. With the usb charger, charging took a longer time, but some were saying that it also lengthened the battery life (charge cycle). Now I don't remember if those were completely accurate results, but I suppose it made sense. But if it was true that a slower charge made for a longer battery life, whats really the difference? At that point, does it come down to battery/cell structure? Because electricity is electricity, for the charger its all dc. So how is the charging rate regulated when plugged into the computer?
These are just things that this thread has made me think of. My conclusion though, is that in regards to battery life, any fixes would all on the software side for now, at least if we are using the stock 1500mA battery. And every 10 people on this board have 15 different ways to increase battery life, whether through a certain rom or what-not.
I also read in another post, that battery technology is not advancing as fast as cellular technology is. So at the end of the day, we have an awesome phone that can literally do almost anything, shorter battery life was to be expected. But its no where near as bad as people were saying it was before june 6th (public launch date).

Just to throw in my .02 cents here...
The battery capacity of 1500mah is hardcoded into the evo's system.
This means that even the sprint extended battery suffers from the flaw of not being charged properly in the evo just like the seidios. I own the sprint extended and the seidios and they both demonstrate the same charging flaw while charging in the evo.
The hardcode is seen while the phone is on. While the phone is off it's possible there is some sort of hardware limitations imposed to keep the full battery capacity locked at 1500mah.
I have been looking into a way to possibly overwrite this hardcode on a rooted evo but so far my efforts have been null.

i believe temperature greatly effects charging and battery life as well.
my makita power tools have a 30 minute rapid charger and in order to get such quick charge times it uses a fan to cool the battery during the charge. the charger includes circuitry to slow down the charge rate if the temperature can't remain cool enough as well.
lithium ion batteries as well.
just shows ya, the batteries likely could charge much faster, but you'd have to incorporate some extra cooling so they don't get damaged.
i'd imagine the OP's assumption is about right.

jasongthang said:
But if it was true that a slower charge made for a longer battery life, whats really the difference? At that point, does it come down to battery/cell structure? Because electricity is electricity, for the charger its all dc. So how is the charging rate regulated when plugged into the computer?
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Click to collapse
The stock Evo battery pack contains a single 1500mAh 3.7V lithium-ion polymer (LiPo) cell. I haven't actually opened one up, but the larger "extended" battery packs probably contain a pair of 3.7V lithium-ion polymer cells wired in parallel which, for all practical purposes, is the electrical equivalent of a larger single cell.
Regardless, LiPo cells don't care whether you charge them slowly or quickly (within reason). There is no electrical or chemical reason why a LiPo that is charged slowly will release it's energy any differently than a LiPo that is charged quickly. The only difference might be that one which is constantly charged at a maximum rate may not be capable of as many charge-discharge cycles before it loses significant capacity. That, by the way, is what the phrase "cycle-life" refers to: The number of charge-discharge cycles a battery is capable of before it wears out.
And neither the internal charging circuit in the Evo or the Seidio external charger will charge a battery at anywhere near the most widely accepted maximum rate for a LiPo (1C). If they did they would charge a dead battery in about an hour.
Pete

Got LiPos?
Here are just a few of mine. The big ones are out in the hangar (garage).
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Pete

PGRtoo said:
Here are just a few of mine. The big ones are out in the hangar (garage).
Pete
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Those deans plugs piss me off sometimes. R/C enthusiast I take it.

Looking after battery

Hi all
Is there a definite answer to how you should charge your battery? Is it better to charge it before it gets to 40% like I have read or does it not really matter?
Also does charging it overnight do any damage?
Thanks all
Chris
Sent from my Nexus 7 using Tapatalk 4

The problem with battery care is that it has been tainted with old information that no longer applies to modern batteries.
The charging and discharging of the battery is tightly controlled by an IC to maximise life regardless of how you use it. All you need to be concerned with is making sure it doesn't sit fully discharged or fully charged for long periods (this is why when you first unbox a device it has about half charge)

Doesn't matter... just charge it when u think it s need to be charged...

High temperature is bad. Full charge is bad (charging 0.1V less than full generally doubles battery life). High temperature + full charge is really bad (negative synergies).
Overdischarge is bad as well, but if you stay above 3.3V or so, there should be no negative effect.
I have hacked my kernel to lower the charge voltage setting from 4.3V to a configurable value between 4V and 4.3V. I will release a kernel patch, once I have done some more testing.
BTW, a lower charge current is better for the battery as well. So if you have time, you can use a standard USB port (only provides 2.5W instead of 6W with the included charger) or add a USB extension cable/use a longer/thinner wire gauge micro USB cable (this will limit the power drawn from the included charger).

Put it this way:
You will have moved on from this device long before you would notice any battery problems caused by "bump charging", charging overnight, or any other normal charging behavior.
Check the Battery University for details about charging Lithium-ion polymer.

tni.andro said:
High temperature is bad. Full charge is bad (charging 0.1V less than full generally doubles battery life). High temperature + full charge is really bad (negative synergies).
Overdischarge is bad as well, but if you stay above 3.3V or so, there should be no negative effect.
I have hacked my kernel to lower the charge voltage setting from 4.3V to a configurable value between 4V and 4.3V. I will release a kernel patch, once I have done some more testing.
BTW, a lower charge current is better for the battery as well. So if you have time, you can use a standard USB port (only provides 2.5W instead of 6W with the included charger) or add a USB extension cable/use a longer/thinner wire gauge micro USB cable (this will limit the power drawn from the included charger).
Click to expand...
Click to collapse
Gulp none of that made sense

chrisnewton said:
Gulp none of that made sense
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Click to collapse
Then you need not worry about it. As I said, the battery is controlled by a fairly sophisticated IC, just charge it whenever you need to.

these batteries love refridgerators. you charge it when it comes to about 20-25%. I'm not compelling anyone, it's just that I've had this type of cycle since three years on my faithful ol' HTC Desire. Now its all burned, but I did have something to compare it with. My czn also got an htc desire a couple of days after i got it, and he is charge-freak. He charges his phone in his home, car, uni, bank, everywhere he can get his hands on a socket. The result: he's run down 4 batteries, and is on the brink of a 5th one. while I had only one throughout my three-year life cycle of my Desire.
So, try not to overheat your battery. Don't use it when charging. Charge it before you sleep at night, and let it rest for overnight. This overnight rest boosts battery life, and your charge will last almost 2 days. this is my personal experience speaking, and with the multitude of custom OC UV kernels out there, you might wanna go Chuck Norris with your battery.

Generally the most common way people damage the batteries is just by heat. Other charging ideals aren't really all that important in the grand scheme of things. The phone and chargers are smart enough to handle the other aspects.
Heat's a problem because the act of charging actually creates heat. So while you think it may not be too hot when it's charging in the mid-day sun in your car, it will be when it warms up from charging. It'll get so hot, in fact, that it may even refuse to charge, although you see this happen more on phones than tablets.
Also, don't leave your tablet dead for a month. That's bad. I don't think anyone does this, though, because what's the point of having a tablet if you leave it dead for a month?

[Q] 100% to 95% battery

Hey guys. Within a minute or so after my phones removed from the charger it drops to 95%.is this normal?im using the 1.8a LG charger that comes with the phone F240L.i read somewhere that they are using the LG charger 1.2a out of the box.does this phone have two different out of the box charger..thanks..

Completly normal. The method that seems to be employed for the battery percentage is read the voltage itself and make a guess
This high voltage drops down quite quickly both as a "load" is applied to the battery,. Plus there is not a lot of change in capacity from the very high voltages to the more normal voltages, in any li-ion battery. So while the voltage can be used to guestimate a range of charge levels, between like 4.0 and 4.3 there isnt much changed in the battery itself.
Further from what i have seen so far (not totally sure) they are charging to 4.35v which is a rescent slight change in the chemistry of the li-ion to allow for higher charge levels without it gassing or reducing the life (Havent tested that theory long enough yet either).
Also All li-ion alogrythms for charging do a CC CV charge, where the final charge is just "holding" the voltage at the high, till the batterys charge state floats up to that level. This can (not facted out yet) mean that leaving it on the charge past the time it claims it is fully charged , it will put tiny bits more into it. This happens more with my big fat zerolemon battery because it seems to have more resistance to the other connected cell items than would be desired.
Anyways all is well, just dont believe anything a computer tells you , and it will be fine The other methods have thier own deficiencies.
Other STUFF:
Li-Ion batteries really do not prefer to be left at their high charge voltages, as they degrade faster there. so when you read the above, or try "bump" charging methods (thats just restarting the charge) It is not good for it. The battery will be happier, using it like it was designed, taking it off the charge when it states it is full. all of this being more info than anyone needs to know, or freaking care about.
As a li-ion battery becomes old and weak, it will exhibit even more of these charateristics that have people wondering. It will drop off the highs quicker still, have less total capacity, and increse a tiny bit in resistance , which will cause it to drop even more under load. At some point the battery would be so bad at that, you would want to replace it.
Heat, the li-ion cells dont like these extreeme heats. they prefer to work more at normal room temps and cold but not extreeme cold. So take that in also as a factor in keeping your battery more happy, again if you want to waste half your life pampering the thing

runwithme21 said:
Hey guys. Within a minute or so after my phones removed from the charger it drops to 95%.is this normal?im using the 1.8a LG charger that comes with the phone F240L.i read somewhere that they are using the LG charger 1.2a out of the box.does this phone have two different out of the box charger..thanks..
Click to expand...
Click to collapse
It's the calibration. Happens to me too sometime. Drops rather fast to 95%, then goes stable around 89%. Just leave it on charge for an extra 45 minutes or so, then let the battery die down to at-least 10% before charging again. Not exact science, it's just what I do.

Leaving phone connected after it finishes charging

I tether with my phone all day and I have to keep it connected because it drains the battery quick. Will it have any negative effects on the battery if I leave it connected even if its at 100%?

whytechapel_x said:
I tether with my phone all day and I have to keep it connected because it drains the battery quick. Will it have any negative effects on the battery if I leave it connected even if its at 100%?
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I do the same and haven't had any ill effects, phone stays on charge at work all day

I believe the charger (and most, if not all, smartphone chargers) intentionally cuts out when the battery is saturated to prevent overcharging. Then top off again once the battery level drops a bit. In fact, on some devices (when attached to charger and fully charged) you will actually see the battery level occasionally drop to 99 or 98% then back up to 100% again. Although I haven't noticed this on the M8 yet.
You can get into a discussion of mini-cycles and other ill effects from keeping the device plugged in all the time. But just anecdotally I do this all the time (just leave the phone on charger overnight most nights) and haven't noticed much (if any) ill effect on battery life after owning 5 HTC devices, plus 2 Samsung tablets; most of which were used 1- 2 years each with very little if any decline in battery life over the time they were used.

Actually leaving the battery at full capacity all the time (if I understood your post) is bad for the long term health of the battery.
You need to find an app that cuts your charger off at 70-80%. Most modern laptops have this functionality built in for people that leave it plugged in all the time.

Heisenberg420 said:
Actually leaving the battery at full capacity all the time (if I understood your post) is bad for the long term health of the battery.
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Technically, I would agree. And "best practice" is to cycle often and avoid leaving the phone on the charger when fully charged. But often folks (myself included) will not always follow what is best, and its not always feasible. As I've mentioned, after owning a decent number of smartphone and tablet devices and using then for 1-2 years, I haven't noticed much or any decline in battery life for the time I was using them (despite often charging them overnight). I have no doubt there might be some slight decrease, and especially of one intends to use the device for more than 2 years. But I personally never do (too much of a gear junkie) and also don't sell/trade my old phones.
Your point is a fair one, as it best the OP to know all the facts, risks, etc. and make his own conclusion. The following link has some interesting technical discussion on charging Li ion: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries

I bought an ampere-meter that measures current from the charge to the device and I have awesome news.
Li poly batteries have a very strict charging procedure (voltage and current should change during the charge). The original HTC charge charges flawlessly.
Once the battery tops up to 100% current drops dramatically.
If I do some power demanding task, the current goes up again. This means that all power consumption is taken from the charger, leaving the battery in 100% all the time, without jittering between 99-100%
NOTE:
Yet. The designers of the Li Poly define it as an electrical spring. This means there is no deterioration in the battery life AS LONG AS YOU DON'T CHARGE THE BATTERY OVER 4 volts.
100% is 4.2 volts, meaning you'd stop charging at 85% to prolong battery life.

Is there a way to turn off the fast charging in the OS?

I plan to use this phone for many years, so I'm worried that the fast charging might do damage to the battery in the long term or shorten its lifespan, so I'd rather charge it "slower". Is there a way to turn off the fast charging in the OS? Or is my worry unsubstantiated?

513263337 said:
I plan to use this phone for many years, so I'm worried that the fast charging might do damage to the battery in the long term or shorten its lifespan, so I'd rather charge it "slower". Is there a way to turn off the fast charging in the OS? Or is my worry unsubstantiated?
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Click to collapse
You made my night... Slower charger kills battery not fast charging.. fast charge save battery to be honest. And you dont have to be worry since the batteries now are LI-lon . Go get info in google about the batteries . All i can say you got infos wrong.
Sent from my ONEPLUS A3003 using XDA-Developers mobile app

Agree with previous post. But if it makes you feel better, just don't use a dash charger...
Very simple.

lummujaj said:
You made my night... Slower charger kills battery not fast charging.. fast charge save battery to be honest. And you dont have to be worry since the batteries now are LI-lon . Go get info in google about the batteries . All i can say you got infos wrong.
Sent from my ONEPLUS A3003 using XDA-Developers mobile app
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OK. I didn't know.
I was speaking from my past experience with Samsung Galaxy Note 4. I bought couple of original Samsung batteries and rotate them throughout daily usage. I noticed a significant difference in battery life comparing the ones that I used fast charge on vs the ones I didn't. After that I stick to NOT using fast charge.
Of course, that's nothing scientific. And Samsung uses a different fast charge mechanism (higher voltage) than OnePlus (higher current), so there could be difference there too.

Because Dash Charge seems to be re-labeled Vooc charging from OPPO, I can tell you, that the last two years with charging minimum one times every day, there is no bad effect on the battery (still the first one).
Sent from my Find7 using XDA-Developers mobile app

513263337 said:
OK. I didn't know.
I was speaking from my past experience with Samsung Galaxy Note 4. I bought couple of original Samsung batteries and rotate them throughout daily usage. I noticed a significant difference in battery life comparing the ones that I used fast charge on vs the ones I didn't. After that I stick to NOT using fast charge.
Of course, that's nothing scientific. And Samsung uses a different fast charge mechanism (higher voltage) than OnePlus (higher current), so there could be difference there too.
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Samsung devices are notorious for killing batteries and its more likely hardware than it is the battery itself, u will be fine

I have a similar question: does it make any problem if I leave the phone in (dash) charge for the whole night? I mean, if I sleep for 7hrs I'll have 1h of fast charging and 6hrs of nothing-but-charger-heating. Will this habit hurt the phone's battery or the charger itself?

513263337 said:
I plan to use this phone for many years, so I'm worried that the fast charging might do damage to the battery in the long term or shorten its lifespan, so I'd rather charge it "slower". Is there a way to turn off the fast charging in the OS? Or is my worry unsubstantiated?
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Click to collapse
I use Samsung 1.5 Amp charger and keep my battery between 40% to 80%
I think these are best for long term usage.

repsol89 said:
I have a similar question: does it make any problem if I leave the phone in (dash) charge for the whole night? I mean, if I sleep for 7hrs I'll have 1h of fast charging and 6hrs of nothing-but-charger-heating. Will this habit hurt the phone's battery or the charger itself?
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I used a samsung S3 before and overnight charging killed my battery! Bless samsung for making battery removable on S3!
If i were you, I wouldn't leave my precious OP3 on an all-night charge.

iam_adarsh said:
I used a samsung S3 before and overnight charging killed my battery! Bless samsung for making battery removable on S3!
If i were you, I wouldn't leave my precious OP3 on an all-night charge.
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Well, it was my first thought, but everyone in this topic is telling me that OP works different than Samsung!

iam_adarsh said:
I used a samsung S3 before and overnight charging killed my battery! Bless samsung for making battery removable on S3!
If i were you, I wouldn't leave my precious OP3 on an all-night charge.
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that's the problem of the charger or the phone itself. thecharger is designed not to charge when the battery is full. What I want to say is you experienced an accident and sorry for you.
The most serious threat to the battery is high temperature. OnePlus 3 reduce the charging heat by its dash charge. The dash charge pushes low voltage directly to the phone, which mitigates the heating problem by pushing high electric current and making the voltage transition process in dash charger. Most of other phones still use high voltage because they fail to create high current. recalling the physics in high school, the power is current multiplied by voltage and energy equals to power multiplied by time. than you would understand the powerful feature of dash charge

dlhxr said:
that's the problem of the charger or the phone itself. thecharger is designed not to charge when the battery is full. What I want to say is you experienced an accident and sorry for you.
The most serious threat to the battery is high temperature. OnePlus 3 reduce the charging heat by its dash charge. The dash charge pushes low voltage directly to the phone, which mitigates the heating problem by pushing high electric current and making the voltage transition process in dash charger. Most of other phones still use high voltage because they fail to create high current. recalling the physics in high school, the power is current multiplied by voltage and energy equals to power multiplied by time. than you would understand the powerful feature of dash charge
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The power is current multiplied by voltage so what's the difference between high current mutiplied by low voltage versus low current multiplied by high voltage ?
2V x A = V x 2A

lapocompris said:
The power is current multiplied by voltage so what's the difference between high current mutiplied by low voltage versus low current multiplied by high voltage ?
2V x A = V x 2A
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qc3.0 uses low current and high voltage. Dash uses high current and low voltage. As a result, they have similar power and both charge quickly. However, the heating problem is more serious for qc 3.0. The difference of the battery voltage and charger voltage is the leading factor that determines the transition efficiency. The bigger the difference is, the more heat charging process generates.
So~ you could look up for qc3.0. for mi 5, it has three adaptive mode: 5V2.5A、9V2A、12V1.5A. for dash, we have 5V4A

repsol89 said:
I have a similar question: does it make any problem if I leave the phone in (dash) charge for the whole night? I mean, if I sleep for 7hrs I'll have 1h of fast charging and 6hrs of nothing-but-charger-heating. Will this habit hurt the phone's battery or the charger itself?
Click to expand...
Click to collapse
There is no problem with leaving your phone on the charger. I do this with every phone since years.
If people experience something bad with it, their phone or battery are broken. The current tech just keeps the battery at full capacity once it's full. Never had any problem.

So many "opinions" but mostly incorrect. The answer to the OPs question is that you don't have to worry about quick charge destroying your battery. It will not have significant impact on your battery capacity. I would have been more worried about breaking the usb type-c port(see point 2 below). All things considered, after 2-3 years you will probably buy a new phone anyway and also you can always buy a replacement battery cheap. But you can simply use a normal charger which delivers <3A with 5V so you don't have to worry about anything.
1- Slow charge does not damage lithium-ion chemistry batteries. You can read about lithium-ion charging here. But neither fast charge will damage lithium-ion as long as the battery temperature is not extremely high. Also temperature at different charge stages effect the capacity decrease (source) But you will be fine as long as the battery temperature is less than 45C. The charging IC should stop the charging process if it exceeds it anyway.
2- Qualcomm's quick charge is much better than voop/dash charge from an engineering standpoint. This is why also USB organization's power delivery (PD) standard uses similar scheme. The problem is the cable and the connector. The maximum allowed current at 5V is 3A with usb type-c connector (source). If you provide more current, you need to use a thicker cable(dash/vooc cables). But you can't change the connector, and it may damage your connector in the long run to use 3+A currents to charge. Because there is a contact resistance (R) and the power lost in the connector is square of current (I) times R. Meaning R*I^2, it will wear off the connector faster. This is why some companies with some engineering skills opt in to use higher voltages instead of higher currents.
3- You can't push more current to lithium-ion battery than it accepts. The maximum current is voltage delta (between charging voltage and battery voltage) divided by internal resistance. This is why you can charge empty battery much faster. If you use an app like Ampere from play store, you can see the voltage of your battery before and after you plug in your charger. If you plug in a normal charger, you will see that it goes up a little bit. If you plug a quick charger it goes up to ~4.35V
4- Yes, there is conversion inefficiencies for quick charge inside the phone, and it will warm up the "phone" and battery only indirectly. The conversion IC are normally >90% efficient (source). This does not mean that your battery will be destroyed. It is perfectly fine to charge lithium-batteries with up to 45C temperatures (source).
4- If overnight charging killed your battery, your battery was faulty (or you had 3rd party battery?). The battery should be capable of holding 4.35v charge. You would need to store battery at 4.35V full charge for over 3 months to loose 20% capacity (http://batteryuniversity.com/learn/article/how_to_store_batteries). Having full charge few hours overnight won't destroy it unless your battery or device is faulty.
With all this information, I would rather opt in for USB-PD/Qualcomm Quick Charge solutions than VOOC/DASH solutions. I think eventually only USB-PD will remain and everybody will use it as a standard only.