Dangerous Battery Charging - HTC EVO 3D

I read few topics similar like this on other web sites, but i need more opinions from you guys. I have 3vo GSM for few days and i am afraid of charging the batery. Why? Because it is going up to 4350mv or 4.35V, and as i know it's too much (it's normal up to 4.1 or 4.2) and with that kind of charge you can reduce battery life. So i need to know is that rom related, kernel related or it's something wrong. I am rooted on MikRunny v1.11 and don't know is that happaning on stock phone. I don't know what is wrong, but i don't like this kind of charging.

It's normal.

majid25 said:
It's normal.
Click to expand...
Click to collapse
It's definetly not normal. It's hurting battery.
Wikipedia:
High charge levels and elevated temperatures (whether from charging or ambient air) hasten capacity loss. Loss rates vary by temperature: 6% loss at 0 °C (32 °F), 20% at 25 °C (77 °F), and 35% at 40 °C (104 °F).
(Many) Lithium-ion battery packs contain fail-safe circuitry that shuts down the battery when its voltage is outside the safe range of 3–4.2 V per cell. ....3.7 V nominal voltage with a 4.2 V max charge.
Typically, lithium-ion cells are charged with 4.2 ± 0.05 V/cell.
Is there something that can fix this????

4350mv is totally normal for our phones.

It's perfectly normal, stop being paranoid. It's just a phone.
Sent from my PG86100 using Tapatalk

Thanks for reply. My phone is charging from 99% to 100% in 45 minutes. Is that normal too??
Sent from my HTC EVO 3D X515m using XDA

kire.htc said:
Thanks for reply. My phone is charging from 99% to 100% in 45 minutes. Is that normal too??
Sent from my HTC EVO 3D X515m using XDA
Click to expand...
Click to collapse
No, that's a lie
Sent from my PG86100 using Tapatalk

bloodrain954 said:
No, that's a lie
Sent from my PG86100 using Tapatalk
Click to expand...
Click to collapse
Lol.
Trust me there are fail safes. Your phone will not blow up and your battery will no spontaneously com bust. Quit being paranoid...

bloodrain954 said:
It's perfectly normal, stop being paranoid. It's just a phone.
Sent from my PG86100 using Tapatalk
Click to expand...
Click to collapse
Just a phone? It's also got a highly volatile battery in it if you charge it incorrectly.
When people say "it's normal", you need to clarity whether normal = phone misreads charge voltage, or if normal = normal to charge at 4.35v. If it's "normal to charge at 4.35v" then that's a real big problem with your phone.
Li-ion is not to be ******* with. Please don't go telling people it's OK when it's not.
[This has been a public service announcement] lol ;-)
Sorry if the tone is harsh, but please go and read some articles on li-ion charging people
meme405 said:
Lol.
Trust me there are fail safes. Your phone will not blow up and your battery will no spontaneously com bust. Quit being paranoid...
Click to expand...
Click to collapse
So at what point are you going to mention one of the fail-safe's being that it vents to atmosphere when the battery pressure get's too high? (possibly with flame).

Overcharging li-ion battery is very dangerous. I did some research and this is what i found:
I fully charged my battery. On battery monitor widget it shows 4349mV. I turn off the phone, take off batery and measure with digital multimetar. It shows 4.31mV. So maybe the phone does't show very accurate stats. I'am still not sure.
This is what i found on web:
A source reached out to us and let us know that the Motorola Bionic's 3.8 V battery is in fact using a new alternative high voltage chemistry, and is not simply an overcharged Lithium Ion battery. This same battery will be used in the just-announced Motorola Atrix 2 as well. Note that the battery name includes an H (eg HW4X) to denote the use of these high voltage battery chemistries. This new chemistry also has similar cycle life as existing 3.7 V nominal batteries, and has been in the works for several years.
It’s just interesting that this particular battery is 3.8 V nominal (4.3 V fully charged), as this 0.1V boost design choice gives the battery a bit more capacity. It isn’t a huge difference, 3.7 V would make the 1735 mAh battery 6.4 Whr, the 3.8 V of this current design makes it 6.6 Whr.
SOURCE: http://www.anandtech.com/show/4910/motorola-droid-bionic-review-dual-core-with-4g-lte/2
This will be useful too:
http://forum.xda-developers.com/showthread.php?t=871051
So i hope that this will help someone.

bloodrain954 said:
No, that's a lie
Click to expand...
Click to collapse
ORLY? I've noticed on several different chargers that my Amaze is moderating the charging rate (and amperage, if you believe Battery Monitor Widget) as it nears 100%. I get "Battery Full" and "Charging complete" alarms well after "100%" is reached.
Both images are from overnight charge cycles, with screen turned off. Autosync and other periodic processes are disabled at night by Llama. Vertical indices represent one hour. Second image is for an HTC stock charger, U250.
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Related

Looking for a Rezound owner w/a thunderbolt

Looking for confirmation that the battery from the Rezound will work with the Thunderbolt. If anyone can confirm this I would greatly appreciate it.
Shawn haz root said:
Looking for confirmation that the battery from the Rezound will work with the Thunderbolt. If anyone can confirm this I would greatly appreciate it.
Click to expand...
Click to collapse
all I can confirm is that the battery from the T-Mobile MyTouch 4G also works in the Thunderbolt(and vice-versa), just not the back covers.
also, once we know if the Rezound/Thunderbolt batteries are compatible, the back covers obviously will not be. so if you're planning on putting one of those extended batteries in the Rezound you'll be out of luck.
The Thunderbolt battery works in the Rezound, at least mine did.
Sent from my ADR6400L using XDA App
I just switched them between my Rezound and my wife's Thunderbolt. They both worked in the opposite phone. However, on the Rezound, the battery icon showed an exclamation point, like something was wrong. Phone still works though. *shrug* Back covers fit on both too.
After getting mine on Thursday I did notice the Rezound battery will fit a Thunderbolt and vise versa but in looking at the voltages the Rezound battery is a 3.8v and the Thunderbolt is a 3.7v so I would mess around with it. The voltages don't match up. But they do fit perfectly.
I ended up buying one at the VZ store. It's working but for some reason my battery is not reporting the correct level. I can't figure out why. I have cleared cache, dalvik, and battery stats (at 100%.) I even wiped and reloaded my rom. Anyone have any ideas on how to fix it?
The voltage is different I believe the capacity of the battery is read by the voltage, so if the voltage is already lower it will read a lower charge.
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Both have the same voltage. 3.7v.
Can't read the Rezound battery.
Sent from my Galaxy Tab 10.1
jbh00jh said:
Can't read the Rezound battery.
Sent from my Galaxy Tab 10.1
Click to expand...
Click to collapse
Thunderbolt: 3.7VDC - 1400mAh - 5.18Whr
ReZound: 3.7VDC - 1620mAh - 5.99Whr
basically, the Thunderbolt battery should work just fine... although since the 'wattage hours' on the Thunderbolt battery is lower(not to mention the 'milliamp hours'), the Thunderbolt battery isn't going to last anywhere near as long as the ReZound battery.
It's working great now. Thanks guys.
Hello, looking at what pictures I could find, the sensation XE and the evo batteries all look similar to the rezounds, any chance someone here has some lying around to test? A 1730mAH battery would be nice if it fits with back cover.
*Edit* Ahh I see there is a 1800mah for the rezound already, ill just go with this!
Shawn haz root said:
Both have the same voltage. 3.7v.
Click to expand...
Click to collapse
Ok, so weird. This is my Rezound battery:
My buddy bought a Rezound at Best Buy just a few hours before me, though, and his has the 3.7v batt. So strange. Obviously, the Rezound is able to cope with either voltage, though.
---------- Post added at 11:16 AM ---------- Previous post was at 11:07 AM ----------
Kotori said:
Hello, looking at what pictures I could find, the sensation XE and the evo batteries all look similar to the rezounds, any chance someone here has some lying around to test? A 1730mAH battery would be nice if it fits with back cover.
*Edit* Ahh I see there is a 1800mah for the rezound already, ill just go with this!
Click to expand...
Click to collapse
Link to the 1800mAh Rezound batt?!
SamXp said:
Ok, so weird. This is my Rezound battery:
My buddy bought a Rezound at Best Buy just a few hours before me, though, and his has the 3.7v batt. So strange. Obviously, the Rezound is able to cope with either voltage, though.
Click to expand...
Click to collapse
Battery voltage is not a constant. A single cell lithium ion battery is rated at 3.7 volts. The 3.8 volts on your pack is probably a miss-label. At full charge, a single cell lithium ion battery will be around 4.2 volts. It will go down from there to a pre-determined low cutoff to protect the cell. If you can find a widget or app that shows battery voltage, you will see what I mean. I've never run my phone down to see what level it shuts off at but I suspect it to be somewhere around 3200 - 3000 mV. As someone who races RC Cars with lithium ion batteries, I can tell you that we usually use 3 volts for a low cutoff to prevent damage to the cells.
SamXp said:
Ok, so weird. This is my Rezound battery:
Click to expand...
Click to collapse
I doubt it's just a wrong label. His part number is different from ours with 3.7V
l7777 said:
Battery voltage is not a constant. A single cell lithium ion battery is rated at 3.7 volts. The 3.8 volts on your pack is probably a miss-label. At full charge, a single cell lithium ion battery will be around 4.2 volts. It will go down from there to a pre-determined low cutoff to protect the cell. If you can find a widget or app that shows battery voltage, you will see what I mean. I've never run my phone down to see what level it shuts off at but I suspect it to be somewhere around 3200 - 3000 mV. As someone who races RC Cars with lithium ion batteries, I can tell you that we usually use 3 volts for a low cutoff to prevent damage to the cells.
Click to expand...
Click to collapse
Yeah, I don't put too much stock in it. I measure close to 4.2v at full charge, but never checked the low voltage cutoff. I used to race RC but that was before LiIon rolled around!
Mooselips said:
I doubt it's just a wrong label. His part number is different from ours with 3.7V
Click to expand...
Click to collapse
And there are a good number with the 3.8v batt. Poll here:
http://androidforums.com/htc-rezound/449482-your-rezound-batt-3-7v-3-8v.html
I have a 3.8 volt battery. I have it in my hand right now.

Galaxy S II battery charge

I had the skyrocket originally but didn't like the lack of custom ROM and not to mention I don't really care about LTE. SO i've been thinking about getting the Samsung galaxy S II since I loved the skyrocket. One thing I did experience with the skyrocket and everything I've been able to research up to this point also indicates the same on the galaxy S II. It takes nearly 3-4 hours to fully charge the phone. Is there any way with custom rom or Kernel or any other tweaks to make this faster? I understand increasing the current to the battery does make it degrade faster, and quite honestly I don't really care. If the battery lasts me 1 year I'm happy with it as the batterys are inexpensive and easily changeable.
its internally controlled by the chip and cannot be changed. period.
Unfortunately, unlike the original GalaxyS series, our device has a fixed charger that only charges at 400 mA (USB) or 650 mA (regular charger). There appears to be no way to change these current limits.
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Entropy512 said:
Unfortunately, unlike the original GalaxyS series, our device has a fixed charger that only charges at 400 mA (USB) or 650 mA (regular charger). There appears to be no way to change these current limits.
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Click to expand...
Click to collapse
SO YOU'RE TELLING ME THERE'S A CHANCE!!
Been awhile since I've seen dumb and dumber
Sent from my páhhōniē
Entropy512 said:
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Click to expand...
Click to collapse
well, thats about 100% better than my chances of doing it But on a serious note, I heard that the faster you charge the less your battery life would have. is that correct? I thought I read that slower charging is better for the battery.
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You can try and change the values using voltage control, but not sure if it will actually lower the charging time.
Sent from my GT-I9100 using XDA App
that isnt an option on my phone.
nyydynasty said:
well, thats about 100% better than my chances of doing it But on a serious note, I heard that the faster you charge the less your battery life would have. is that correct? I thought I read that slower charging is better for the battery.
Click to expand...
Click to collapse
True - There are two ways you can use "life" to describe a battery:
1) Capacity for a given charge
2) Number of charge/discharge cycles before 1) gets reduced - Charging a device faster and "bump charging" that last little bit of juice in at the end is bad for this
On the Infuse I had a custom algorithm that was intended to provide improved charge rates for deeply discharged devices, but not stress the battery TOO much - The algorithm dropped current early as voltage increased, and also cut off charging earlier. So it took longer for the last phase of charging, but could charge a deeply discharged battery much faster.
cfaberlle said:
You can try and change the values using voltage control, but not sure if it will actually lower the charging time.
Sent from my GT-I9100 using XDA App
Click to expand...
Click to collapse
Siyah removed those features in later versions after this video:
http://www.youtube.com/watch?v=FL71G2YEIHU
I use my HP Touchpads charger and it seems to charge pretty quickly, though I never timed it. CurrentWidget says its charging at around 1800mA.
*sigh*
Someone didn't read the first post of the thread for the kernel they're using in its entirety...
You are not charging at 1800 mA.
I did not....:x good to know though, my bad!

Andida extended battery

Does anyone know If this battery is any good?
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Sent from my HTC_Amaze_4G using Tapatalk
I ordered mine from OBOStore about 5 days ago for just under $9 shipped...they come straight from China so shipping will take a couple weeks.
I have heard mixed reviews about Andida, but imho its just as good as Anker
Sent from my HTC_Amaze_4G using xda premium
magiconthetire said:
I ordered mine from OBOStore about 5 days ago for just under $9 shipped...they come straight from China so shipping will take a couple weeks.
I have heard mixed reviews about Andida, but imho its just as good as Anker
Sent from my HTC_Amaze_4G using xda premium
Click to expand...
Click to collapse
thanks for your input
Sent from my HTC_Amaze_4G using Tapatalk
In my honest opinion Anker trump all but anything besides stock probably have an advantage. I reccomend the Anker 2 pack plus charger on Amazon personally
I can't post a link due to the fact I lurk and don't ever post apparently. I'll only you it
Anker x 2 + Charger from Amazon...
Flipnfr3ak said:
Does anyone know If this battery is any good?
View attachment 1041582
Sent from my HTC_Amaze_4G using Tapatalk
Click to expand...
Click to collapse
I used them with my hd2. They did not have anywhere near the claimed capacity, but were better than stock. They weren't available when I bought spare batteries, so I'm using Anker. With ICS I don't use the spare batteries much anyway.
Sent from my HTC View somewhere in LALA land
I've read numerous reports about the Anker displaying inaccurate % after a full charge and such. Guess I'll give it a shot myself and order one. Anything better than the stock battery is preferred.
Sent from my HTC Ruby
Inaccurate % was due the different voltage in batteries. All of ankers batteries out there for our phone are 3.7V and we use a 3.8V. There used to be a very extensive report on anker and another company somewhere in our forums but I can't find it.
Just to be clear there's nothing wrong with using a undervolted battery as long as you aren't undervolting trough setCPU or any other similar program. It will have a negative effect on batter life and phone preformance.
Sent from my HTC_Amaze_4G using XDA
getrdy said:
Inaccurate % was due the different voltage in batteries. All of ankers batteries out there for our phone are 3.7V and we use a 3.8V. There used to be a very extensive report on anker and another company somewhere in our forums but I can't find it.
Just to be clear there's nothing wrong with using a undervolted battery as long as you aren't undervolting trough setCPU or any other similar program. It will have a negative effect on batter life and phone preformance.
Sent from my HTC_Amaze_4G using XDA
Click to expand...
Click to collapse
I've always wondered if the Amaze phone hardware charges to 3.8, and may have problems with overcharging the Anker. I have always charged my Ankers via external charger.
getrdy said:
Inaccurate % was due the different voltage in batteries. All of ankers batteries out there for our phone are 3.7V and we use a 3.8V. There used to be a very extensive report on anker and another company somewhere in our forums but I can't find it.
Just to be clear there's nothing wrong with using a undervolted battery as long as you aren't undervolting trough setCPU or any other similar program. It will have a negative effect on batter life and phone preformance.
Click to expand...
Click to collapse
stevedebi said:
I've always wondered if the Amaze phone hardware charges to 3.8, and may have problems with overcharging the Anker. I have always charged my Ankers via external charger.
Click to expand...
Click to collapse
O.K. so I shouldn't be charging it in the phone at all? or just not to 100%? because it seems whenever I do charge it to 100% as soon as I take it off it drops to 96% almost instantly... but I usually get 12-14hrs of med-heavy usage... and usually at least 6hrs of extreme usage... so I think it does have capacity... wish I had done a little more research before buying though, would have bought a 3.8V battery...
blast0id said:
O.K. so I shouldn't be charging it in the phone at all? or just not to 100%? because it seems whenever I do charge it to 100% as soon as I take it off it drops to 96% almost instantly... but I usually get 12-14hrs of med-heavy usage... and usually at least 6hrs of extreme usage... so I think it does have capacity... wish I had done a little more research before buying though, would have bought a 3.8V battery...
Click to expand...
Click to collapse
No, I have actually been charging it in my phone these days. It started when I forgot I had swapped out my OEM battery, and it was fine in the morning. So you can use the phone to charge.
I don't know if there are any 3.8v batteries of this size, except OEM.
EDIT: Mine drops % pretty rapidly after disconnecting the power as well.
stevedebi said:
EDIT: Mine drops % pretty rapidly after disconnecting the power as well.
Click to expand...
Click to collapse
Thanks for the feedback, it must just be the voltage difference that throws off the system... I appreciate your prompt input!

Battery mAh measure?

Anyone know of an app that measures the battery's mAh?
I have tried battery monitor by 3c, but I don't think it works completely with HTC phones.
Either it keeps saying measurement requires 40% or larger charging cycle or it reports something crazy..
Thanks in advance..
Sent from my Sensation using XDA
elmalote said:
Anyone know of an app that measures the battery's mAh?
I have tried battery monitor by 3c, but I don't think it works completely with HTC phones.
Either it keeps saying measurement requires 40% or larger charging cycle or it reports something crazy..
Thanks in advance..
Sent from my Sensation using XDA
Click to expand...
Click to collapse
Battery Calibration, search for it on the market
creeve4 said:
Battery Calibration, search for it on the market
Click to expand...
Click to collapse
It doesn't show mAh only mV judging by the screen shots.
Sent from my Sensation using XDA
Is this you are looking for
https://play.google.com/store/apps/details?id=com.manor.currentwidget
Sent from my Sony Xperia Neo using Tapatalk 2
Tenacius D said:
Is this you are looking for
https://play.google.com/store/apps/details?id=com.manor.currentwidget
Sent from my Sony Xperia Neo using Tapatalk 2
Click to expand...
Click to collapse
No, I'm looking for something to show the battery's capacity. Like for example 1520mAh.
Sent from my Sensation using XDA
Something like this?
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Sent from my E15i using xda premium
elmalote said:
Anyone know of an app that measures the battery's mAh?
I have tried battery monitor by 3c, but I don't think it works completely with HTC phones.
Either it keeps saying measurement requires 40% or larger charging cycle or it reports something crazy..
Thanks in advance..
Sent from my Sensation using XDA
Click to expand...
Click to collapse
hey i would also suggest using the battery monitor widget pro as it has settings for u to set the mAh and then it will calibrate itself accordingly
letaureau said:
hey i would also suggest using the battery monitor widget pro as it has settings for u to set the mAh and then it will calibrate itself accordingly
Click to expand...
Click to collapse
I know this thread is old. But in case anyone still interested, you can find it by looking at your physical battery(if you have a removal battery of course)
Look for Wh and V printed on the battery.
mAh = Wh × 1000 / V
Example:
Samsung Galaxy S3: 3.8 V 7.98 Wh
7.98Wh × 1000 / 3.8V = 2100mAh
I think he meant how much Mah or capacity is actually left on the battery. You can do this in Linux, but not sure about Windows or Android. For example my laptop battery is rated at 4400mah, but the Lubuntu tool tells me max capacity is only 2920mah now.
Well, I think what he needs is to test the battery capacity, as we know lot of 3rd party battery claim higher capacity than it does.
The way to do this correctly by measuring the battery using mAH meter.
But if you want to do it by software, I think you can use this
https://play.google.com/store/apps/details?id=ru.NanoDinamics.NovaTester
But, I'm not sure either this will give you an accurate result.
Noel212 said:
Well, I think what he needs is to test the battery capacity, as we know lot of 3rd party battery claim higher capacity than it does.
The way to do this correctly by measuring the battery using mAH meter.
But if you want to do it by software, I think you can use this
https://play.google.com/store/apps/details?id=ru.NanoDinamics.NovaTester
But, I'm not sure either this will give you an accurate result.
Click to expand...
Click to collapse
Gonna check it, but as my battery is about 3 years and some months old (Galaxy S2), I won't have any way to know if the result is OK.
Thanks for sharing the app!!
Well, after running the full test, it showed that my battery's real capacity is a hilarious amount of 750mAh, not even one Ampere per hour. I estimate about 1800 charging cycles
escarabajo said:
Well, after running the full test, it showed that my battery's real capacity is a hilarious amount of 750mAh, not even one Ampere per hour. I estimate about 1800 charging cycles
Click to expand...
Click to collapse
wich of the 3 tests did you use? (in nova battery tester)
issy_i said:
wich of the 3 tests did you use? (in nova battery tester)
Click to expand...
Click to collapse
The longest one, ran it till the battery died
escarabajo said:
The longest one, ran it till the battery died
Click to expand...
Click to collapse
okay thanks, then i will do that test too, my original 1650mAh is also about 3 yrs old so im very curious
issy_i said:
okay thanks, then i will do that test too, my original 1650mAh is also about 3 yrs old so im very curious
Click to expand...
Click to collapse
When finished let me know rhe results, although my S2 is retired now, I am curious about the results
escarabajo said:
When finished let me know rhe results, although my S2 is retired now, I am curious about the results
Click to expand...
Click to collapse
Okay i will
now im using an 1 year old mugen extended battery (3200mah), i will put this batt tot the test too
overall im still happy with the S2, its far from ready to sent to retirement just yet lol
okay the test is started
Here it is and im very suprised, +- 400mAh loss in a period of 3 years
here is the result of the test of the Mugen 3200mAh battery.
(bought it used a year ago, so i dont know how long it was used before i bought it).
And i did my research, this battery has been tested (new) and give arround +- 2400mAh in real-time even though Mugen claiming its 3200mAh
overall +- 250mAh loss, im very pleased with the performance
btw for informative purposes the screen was at full brightness in both tests

Note7 appears to be charging at 18W via USB PD

Not sure if this is dangerous or not... and really don't see how this is even possible. Charges at the full 9V/2A on my Pixel XL OEM charger.
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The power supply would not be anywhere near 100% efficient, so what it is taking AC is going to be close to double what it is giving to the phone.
Sent from my SM-G935F using Tapatalk
use those usb 3v-20v power meters, about $10 on ebay, it will give you a more accurate usb power output reading.
https://www.aliexpress.com/item/201...er-For-Cell-Phone-Power-Bank/32623928144.html
tonymy01 said:
The power supply would not be anywhere near 100% efficient, so what it is taking AC is going to be close to double what it is giving to the phone.
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Yes, it actually is near 100% efficient. You're saying it's only about 50% efficient which is an absurd unsupported statement. My Pixel XL reads 18W~ just like this when it charges from 0% - does that mean it's not charging at 9V/2A? No, it's definitely charging at 9V/2A.
sonhy said:
use those usb 3v-20v power meters, about $10 on ebay, it will give you a more accurate usb power output reading.
https://www.aliexpress.com/item/201...er-For-Cell-Phone-Power-Bank/32623928144.html
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Click to collapse
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
Absurd? I did some quick googling to try to find the efficiency of a switch mode supply, it definitely isn't 100% so I decided to make it easy for the o.p. and give a 50% example.
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Nitemare3219 said:
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
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not sure what device you speak of, but I'm talking about wattage energy monitors and all my watt meters work with me note 7 as they should... qc just means higher voltage and current, nothing fancy, and so it does show 9v @1.8A or so which is what its meant to do anyways.
Cmon people use some common sense.
The battery has a nominal voltage of around 4.4v fully charged. It has a capacity of 3500mAh.
These means a charge current of 3.5A is a charge rate of 1C which is fine. Even a charge rate of 7A would only be 2C.
As for the 9v, I GURANTEE there are some losses. It would have to convert 9v to 3-4.4ishV depending on charge current.
Let's say the battery is low and it's charging @ 3.5v or so as first part of the typical CC / CV charge cycle.
This means a constant current of X with a variable voltage which early on might only be let's say 3.5v on the voltage curve early on.
Watts = Voltage(Current)
18 = 3.5X
X= 18/3.5
X=5.14
So 5.14 Amps @ 3.5v would be going into the battery during this early on fast charge.
With a capacity of a whopping 3.5Ah, a charge current of 5.14Ah means a charge rating of 1.47C
Now remember, there are some losses from the conversion too.
So under 1.47 (probably under 1.3-1.4 with energy losses) C rating seems normal.
Personally, I wouldn't exceed 1C which is why I disable fast charge.
---------- Post added at 02:20 PM ---------- Previous post was at 02:18 PM ----------
Nitemare3219 said:
Yes, it actually is near 100% efficient. You're saying it's only about 50% efficient which is an absurd unsupported statement. My Pixel XL reads 18W~ just like this when it charges from 0% - does that mean it's not charging at 9V/2A? No, it's definitely charging at 9V/2A.
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
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Click to collapse
Please read my post above. It is NOT charging at 9V. Feeding 9V into a lithium battery would make it explode.
It is being converted using some DC-DC converter so the battery gets fed around 3.something to 4.4v during the CC/CV charge curve.
tonymy01 said:
Absurd? I did some quick googling to try to find the efficiency of a switch mode supply, it definitely isn't 100% so I decided to make it easy for the o.p. and give a 50% example.
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It's probably about 95% efficient actually, which is pretty close to 100% in my book.
There's inefficiency in the battery however, since the phone gets warm when charging, right? And warm = energy being dissipated as heat. i.e. you have to put more than 3500 mAh in, in order to fully charge a 3500 mAh battery.

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