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  • 1 Post By JudH
  1. Thread Author  Thread Author    #1  

    Exclamation Battery charging voltage too high...problem?

    I downloaded the GSam battery monitor and noticed that my cell voltage is at 4.338 @92f(ambient 70f) when on the charger. My understanding is that the cell voltage should never exceed 4.205v or else it can damage or stress the battery... Or worse. Is everyone else out there seeing a similar voltage? I tried using an iPhone charger with the factory Samsung usb and I'm seeing the same thing. Either the internal battery voltage sensor is off or this thing is getting overcharged.
  2. #2  

    Default Re: Battery charging voltage too high...problem?

    I also have a charging voltage of 4.332v and it hasn't been a problem as far as I know. Where did u read about the correct voltage level?

    Sent from my Samsung Galaxy S4 using Tapatalk 2
  3. Thread Author  Thread Author    #3  

    Default Re: Battery charging voltage too high...problem?

    Quote Originally Posted by BillyMichael92 View Post
    I also have a charging voltage of 4.332v and it hasn't been a problem as far as I know. Where did u read about the correct voltage level?

    Sent from my Samsung Galaxy S4 using Tapatalk 2
    I've done my fair share of research on batteries in the past as I was always interested in getting the most out of my devices. Battery university has some good articles on lithium ion cells and how they should be treated. 4.2 seems to be a critical voltage with pretty much all lithium ion cells. It's the absolute upper limit of its recommended voltage range. Lithium ions don't like being deep discharged and they don't like being kept at high voltages(i.e. 4.2v and over). Manufactures push these batteries as close as they can to 4.2v to get as much juice out of them as possible even though it's harder on the battery. From what I have learned anything over 4.205v is pretty bad for the cell and can cause a decrease in performance over time and cause the cell to fail much quicker than normal. It has something to do with the chemistry, lithium ions are somewhat sensitive to voltages.

    Unless Samsung is using some super lithium ion battery with a different chemistry which can support 4.3xx volts then our batteries are getting stressed pretty hard. I read that the HTC evo 3d had issues of overheating due to being charged at 4.3v and people's batteries were going bad. I called Samsung and they said that the battery's normal charging temp can be as high as 99f so at least my cell isn't showing any signs of overheating yet. It's possible the voltage sensor in the phone is off. Who knows. That's why I was wondering If everyone's else's battery voltages were the same as mine.
  4. #4  

    Default Re: Battery charging voltage too high...problem?

    did you fix over voltage problem on your s4 ?? i have a same problem too
  5. #5  

    Default Re: Battery charging voltage too high...problem?

    Any further word on this?
  6. #6  

    Default Re: Battery charging voltage too high...problem?

    I too just noticed this "issue"

    as one of the previous posts said already, 4.2 or 4.25 is what I know the max for li-ion batteries for these years. When the galaxy s3 show 90% power, I take the battery out and measure it, already 4.215 volt...

    So I suspect its max voltage is set to 4.3, which then would have a nominal 3.8v or so rather than the most seen 3.7v. and sure the battery's nominal voltage is 3.8 printed on the battery.

    So, I think this isn't an issue but intended. am not a specialist in the field so not quite sure what chemical differences are causing this..

    BTW, the galaxy s3's charging function is quite bad indeed... I've two here that don't charge while the phone is off(normal while on). one of them continually vibrate with black screen(about 1 vibrate every 5 seconds), the other one vibrate every 5s too with the gray empty battery symbol respectively. For same charging method(plug in the cable while the phone is off), my other good galaxy S3 would vibrate once, then the gray empty battery symbol with white circle inside, then a battery symbol with "green fluid" filling up inside representing the power percentage. Suspected faulty usb port.

    =====
    final word,
    I have heard about galaxy s3 exploding while charging(yes, there are reports on the web already, just google if interested), and there are just so many posts talking about all kinds of charging problem that galaxy s3 has... I'd just charge the battery up to 85%~90% only every time to be safe lol~ if I have time, I might try charging the battery using external hobby charger so I can measure the capacity. If it needs to be about 4.3 or 4.35v to be 2100mah(confirming it's not being over-charged), maybe i could feel better then ~ extra info, looks like there are 4.3v and 4.35v 18650 batteries available too, so maybe we are just not keeping up with the new technologies
  7. #7  

    Default Re: Battery charging voltage too high...problem?

    I tested the battery externally under load and I confirmed the sensor is right. The thing I don't get is that when you charge an l-ion battery to 4.3 volts it lasts 1/3 the time as a battery charged to 4.2, and according to the battery meter this only makes a 4% difference. Really samsung? Dropping 2/3 the lifespan to get 15min more out of the battery?
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  8. #8  
    bbbfalcs's Avatar

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    Default Re: Battery charging voltage too high...problem?

    Having come from the HTC One I am a little sensitive to cell charger specs..

    The charger that comes with the S4 had a 2.0amp output rating which worried me so I have never used it.

    I charge overnight mostly.. I have stuck with chargers that have < 1.0amp output.


    Does this even matter? Should I be looking at the voltage instead of the amperage?

    TIA
  9. #9  

    Default Re: Battery charging voltage too high...problem?

    Quote Originally Posted by bbbfalcs View Post


    Does this even matter? Should I be looking at the voltage instead of the amperage?

    TIA
    Both, slow charge is better, low voltage is also better

    @T-Mobile GN3
    3200->Centro-->Pre-->Pre2-->HOX/N4-->GN3
    Palm T|X-->Transformer-->Galaxy Tab 7.7-->iconia w510
  10. #10  

    Default Re: Battery charging voltage too high...problem?

    Quote Originally Posted by bbbfalcs View Post
    ... Should I be looking at the voltage instead of the amperage?
    Yes ... but what are your worries about amperage?
  11. #11  

    Default

    Quote Originally Posted by Codeman862 View Post
    I tested the battery externally under load and I confirmed the sensor is right. The thing I don't get is that when you charge an l-ion battery to 4.3 volts it lasts 1/3 the time as a battery charged to 4.2, and according to the battery meter this only makes a 4% difference. Really samsung? Dropping 2/3 the lifespan to get 15min more out of the battery?
    I did a little search ... there are Li-based batteries with overvoltage protecting (OVP) of 4.35V
    Maybe Battery University should update ... but even if these batteries are safe, have they the same count of discharge cycles over their lifetime as batteries with an OVP of 4.2V?
  12. #12  

    Default Re: Battery charging voltage too high...problem?

    Quote Originally Posted by Adamsberg View Post
    Yes ... but what are your worries about amperage?
    Don't worry about too much amperage available at the wall adapter. The actual charger hardware is in the phone and it will only pull the amps it needs. You could use a 200 amp power supply and you'd see no difference on the battery side of the internal charging circuit.
    Adamsberg likes this.
  13. #13  

    Question Re: Battery charging voltage too high...problem?

    Hi. Is this thread still going?

    I have a Feiteng I9300 (that's a capital letter "i" not a "1" or a lower case "L" - awful typefaces) which is a Samsung look alike dual sim 4.7" phone. Had 4/5 months. Very good but what used to be occasional "overcharging" notices - EVEN WHEN NOT CHARGING - have become so common that I am probably about to return it for refund (as Amazon can't replace) because it can't be far off failing totally unless I use an external charger(?)

    This is it
    4.7&#39;&#39; capacitive 3G SmartPhone Android 4.0 1GHz Dual: Amazon.co.uk: Electronics

    It uses a EB-L125LLU battery which is marked as 3.7v. But my meter - afaik reliable - shows my two batteries one just above 4.0 one just below.

    Does anyone understand what causes the problem, or how charging works? I understand basic electronics and analogue battery charging concepts of a charging voltage above the cell voltage but don't know if these apply to these devices which may do magical digital stuff! IIUC a standard USB socket provides 5v at up to 1 or 2 amps, but what do chargers do.

    Anyone know if you can ger meters for USB power sockets? Too fiddly for multimeters!


    Only other problem with my phone is that the 512MB RAM gets full and since I installed an SD Card it does not seem to use the internal 2GB ROM at all. Most apps work with mainly the SD card and just a small amount of RAM but some like Yahoo! Mail and Google Hangouts do not seem able to use the ROM. I don't use or want eg Google Hangouts but seem unable to delete it. Are these known issues? And are there solutions?

    Thanks in advance for any help or pointers

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