HTC Evo 3D Voltage/Heat IssuesSupport

Does your 3vo get hot under the following charging conditions? (click choices in wall _and_ USB)

  1. YES - when using the wall charger, my phone gets hot

    33 vote(s)
  2. NO - when using the wall charger, my phone stays cool

    59 vote(s)
  3. MAYBE - when using the wall charger, mine is sometime hot, sometime not

    35 vote(s)
  4. YES - when using USB/computer, my phone gets hot

    15 vote(s)
  5. NO - when using USB/computer, my phone stays cool

    55 vote(s)
  6. MAYBE - when using USB/computer, mine is sometime hot, sometime not

    20 vote(s)

Last Updated:

  1. EVO3D

    EVO3D Active Member

    Thank you for the write up spy2jgc. This is a major problem that needs to be addressed. Like others, I have noticed my EVO 3D tends to get very warm when I plug it in to charge in the wall charger. I have also noticed my battery life decreasing. Today for whatever reason I noticed my phone was very warm nearly all day! Your thread/sticky has prompted me to research this issue further...thanks!

    spy2jgc likes this.
  2. po96od

    po96od Member

    When I first read this an hour ago, my phone, according to Elixir, was charging (via wall socket) at around 3900 mV. When I checked just now, though, it was up to 4350 mV. Temp is presently 94.5, which doesn't seem too bad, and I can't say I've noticed it running hot generally, on or off the charger. Still, that voltage number is worrisome, given the rest of the info in this thread.
  3. mak916

    mak916 Well-Known Member

    The app I use does not show the voltage. But I plan to use one that does now that this has been brought to my attention.
  4. AndroidSPCS

    AndroidSPCS Well-Known Member

    Bummer. This is alarming. I was going to order the Evo 3D today...but looks like I will hold off until this is resolved. :(

    PS - what tools / apps can show voltage?
  5. EarlyMon

    EarlyMon The PearlyMon Moderator

    marctronixx and AndroidSPCS like this.
  6. Rose4uKy

    Rose4uKy Well-Known Member

  7. ghacker

    ghacker New Member

    I'M charging mine now on USB voltage is at 4346mV which is high and the temp is 89.8
    marctronixx, spy2jgc and EarlyMon like this.
  8. spy2jgc

    spy2jgc Member

    Just a note: You'll see the "peak" voltage only when the phone is nearing it's capacity.... like you will likely see 4.2V around 80% of charge... if you look at the voltage at that time, it will look normal or even low.... but when the phone is near it's capacity, the Voltage should stay at 4.2 and STAY there... never exceed it. The temperatures I've noticed are 105 and 108, voltage peaking at 4385 at 97-100% charge. Currently I'm charging and the phone is at 43% and reading 95 degrees, 3.976 volts. Once it hits 4.2 volts, the temp will climb a lot and the amperage into the battery will drop a lot. If you use a car charger, they typically charge at a lower amperage (400 mah to 700mah) and that can keep the battery cooler, but most will charge at 5 Volts are higher (with the phone reducing the voltage to 4.2 if working properly)... and the extra voltage is what is frying the phone. Then, when the phone is unplugged, the battery has TOO much voltage (but the same mAh, or capacity.... roughly) so the battery drains that voltage way too fast... heating up the phone and battery. A lower mAh charge rate should help reduce the heat a bit, but add more time to the charge... but the high voltage is still what is going to do it in. These phones run great on 3.7 up to 4.2 Volts, but when past that it's just too much "PRESSURE" going through the phone, heating it up. The only thing I can think may POSSIBLY help is if you find a charger (home, car or otherwise) that ONLY puts out 4.2 volts.... then the phone has no choice but to keep it there.

    I've been considering pulling the battery when it needs to be charged and putting it on my digital charger at 4.2 Volts, but then it defeats the purpose of the phone charger, or being able to keep my phone on when I charge the battery. Sprint says they will note this is happening, but I don't really know how to draw it to the attention of them and/or HTC in a timely matter... mainly meaning before everybody's 30 day phone guarantee is up.

    Another option is to unplug the phone when the battery is at 4.2 volts when charging, that will stop the battery from getting to high of voltage, but then it won't have anymore mAh going into it.... meaning a battery capacity of only 70 to 80% or so of original design.

    In the end, putting a slower charge rate on the phone (below the 1 Amp/1000 mAh charge rate) will definitely help with the heating issue in some ways, but once you surpass 4.2 on the voltage, it's going to heat up.

    I know one thing for sure... LiIon and LiPo batteries are not to be "played" with.... when RC packs are charged beyond 4.2 volts (nearly impossible with a digital charger), they tend to get HOT, puff up, and if it continues burst and/or catch fire. RC batteries hold 8.4 Volts at 5,000 mAh so it's much more of a danger, but a fire or burst with a LiIon battery at any voltage is dangerous.

    P_Dub and EarlyMon like this.
  9. spy2jgc

    spy2jgc Member

    If your phone is near 100% charged and at 4196mv that is perfect... nothing past 4200mv/4.2Volts. Now if you were at 50% charge and showing 4196mv, I'd worry. You should get to around 4.2V around the last 10 to 5% of the charge, maybe even less than that. 4.2V is the magic number.

    34C works out to about 95F... it's warm but personally I wouldn't worry about it.
    Rose4uKy and marctronixx like this.
  10. spy2jgc

    spy2jgc Member

    "Battery Monitor Widget" works great at monitoring both incoming (charging) voltage and amperage and temperature, as well as discharge amperage, voltage and temp (in degrees F or C). You can also have it track the batteries temp, voltage and amperage history and store it for you, although when it is keeping track of the history I believe it uses more battery power, as it is continually checking voltage and amperage and recording it as often as 1 sec to 1 hour (depending on how often you set it).
    EarlyMon and marctronixx like this.
  11. spy2jgc

    spy2jgc Member

    Thanks.......... I just want the best for all of us users... I want to keep my phone! It's too easy for people to say "Android just runs hot", which many do... but this is a totally different issue. I would like it addressed too, and hope it can be done with a software fix and isn't a hardware issue.

  12. marctronixx

    marctronixx Moderator Moderator

    consumers demand smaller, thinner , lighter handsets so manufacturers want to give them what they want.

    compromises have to be made..

    batteries still need to be charged and they still will produce heat.. those go hand in hand.

    problem is now with these thinner smaller handsets everyone wants, the heat has no where to go.. so the entire handset becomes a heat-sink.

    i would not call a handset that gets hot a "Defect" per se...its the nature of the beast..

    great technical posts thus far however i wanted to chime in and give a different perspective amongst all of the techno-babble so as not to scare potential new users or current owners... (and i do love techno-babble) :)
  13. spy2jgc

    spy2jgc Member

    USB charging will put out about the same voltage, 5 Volts or 5.2, somewhere in there... so your phone (if it has a voltage issue) will still peak at higher Voltages... but since the amperage (capacity) of the battery is being filled more slowly due to the lower amperage charge rate of the USB, the battery won't likely get AS hot, but the voltage is still doing it's damage.... creating heat and shoving too much "power" through a system and battery designed to hold a peak of 4.2 Volts. Personally, I've changed my charging habits. I plug it in, and once it's full or as full as it can get in a couple of hours, I get the phone OFF the Voltage. No overnight charging for me anymore. Slower charging is usually always a good thing for a battery... gives it a longer life, and conditions the battery. But when the phone can't control how many volts it's giving the battery, or stop once charged.... I just don't know.
  14. spy2jgc

    spy2jgc Member

    Yes, I agree with you...sorry for the babble. There is that line... internal antenna's, high discharge batteries, fast charge times, phones that are basically computers.... they all put high demands on a system that we all want and is a technological wonder. And it all works pretty seemlessly, when the system works perfectly. I think if people are aware that there is not likely an issue with their phone as long as the battery isn't over charging, things are good.

    But IF there is this issue out there, I wanted it brought to our attention so we can get it addressed and fixed. These are great phones, HTC and Sprint worked hard on them and we waited patiently for them... we all want them to be the best they can be. It's a result of these forums we have the wonderful products we do, and why companies invest to much time and research into exploring them. A happy customer makes a happy company which makes a great product... the circle of gadget life.
    marctronixx and EarlyMon like this.
  15. Vanquished

    Vanquished Well-Known Member

    I haven't noticed my phone get too hot while charging it. I use the USB cable it came with to charge it from my PC most of the time, and then I use my old LG Rumor to charge it from the wall.

    I have only noticed it get really hot once, and that was when I had the display settings on "never off" while I was downloading about 1gb worth of data over 3g. After about 2 hours the battery was down to 15% and was exremely hot.

    I'll play around with the System Panel app and see what happens while charging it with both the PC and the wall chargers.

    EDIT: This System Panel app is pretty cool. Right now the battery is at 72% and 27.5 degrees C on the USB/PC charger. Does the app also tell you data speeds over the network (3g, wifi, 4g, etc.)? It has all kinds of cool information, along with it's built in task manager, it would be nice if it had that (paid version maybe?).
    EarlyMon likes this.
  16. EarlyMon

    EarlyMon The PearlyMon Moderator

    As The Hitchhiker's Guide to the Galaxy says on the cover in glowing letters with an unusually friendly font:

    Don't Panic

    There is evidence that some phones are charging at the wrong voltage. A symptom is heat.

    Not all heat indicates a problem. High heat while charging means you should monitor charging voltage.

    I'm keeping mine. But until Sprint/HTC chime in, it's socially responsible of us to gather community data and awareness. In my opinion.
    ghacker and spy2jgc like this.
  17. Vanquished

    Vanquished Well-Known Member

    What cases are peope using? It seems like cases could be culprits to the heat problem (while on the go, maybe not necessarily while charging).
  18. EarlyMon

    EarlyMon The PearlyMon Moderator

    I wish I had made the poll differently.

    Heat is a symptom.

    The issue is charging voltage.

    I'd thought that by mentioning the symptom it would be easier to follow.

    Charging voltage is the whole deal here.
    Vanquished likes this.
  19. died4u525

    died4u525 Well-Known Member

    So I downloaded an app to check on this battery issue because I have noticed that my phone does get hot, although it doesn't seem to be consistent. I don't know whether that's normal or not. When it does get hot, its usually the glass or plastic that covers the cameras that gets hot. I just charged my phone. It was 50% charged when I plugged it into the wall. The highest it went as far as mV is 4357mV and the temp went no higher than 93.3 degrees. As a matter of fact the temp went up and then as it continued to charge it came back down. It stayed around 91.5 degrees for most of the time spent charging. I'm going to continue to keep an eye on this for a while. And I just looked at it now. It's at 99% charged, 4357mV and 90.1 degrees. Sounds good to me. I'm using Battery Monitor Widget, by the way. It doesn't feel hot at all, this time. I had WiFi turned on and was using my WiFi connection at the time it was charging but had GPS, 4G and Bluetooth turned off. And my phone is not in a case. I only have a Zagg Invisible Shield on it.

    I'm just wondering, shouldn't HTC or Sprint or somebody be able to use software to not allow the phone to charge above 4.2 volts? I don't know much at all about these kinds of things but it seems to me that they should be able to use software to restrict that or is that not something that can be done with software? Just curious.

    This is my very first post here. I figured it was time, since I've been kind of lurking and picking up tips since just before I got my EVO 3D on launch day. So I just wanted to say hello and thanks for all of the useful info I've gotten here.
    EarlyMon likes this.
  20. EarlyMon

    EarlyMon The PearlyMon Moderator

    Welcome to the forums!

    If the charging stuff is programmable then software could fix it. If the charging stuff is all hardwired, then software can't. There's not just one way to make a charging circuit.
  21. spy2jgc

    spy2jgc Member

    Part of this is technical, but it helps to understand that heat is NORMAL, but excess heat and/or voltage is NOT... your phone/battery might be running hot, but it doesn't necessarily mean you have a voltage problem. Knowing the MAX voltage that your battery is reaching while charging is important, and remember, max voltage is not reached until the battery is usually over 80% charged. If your battery or phone is getting warm but NOT EXCEEDING 4.2 Volts at anytime during charge, it shouldn't be a voltage issue.


    High charge levels and elevated temperatures (whether from charging or ambient air) hasten capacity loss. Loss rates vary by temperature: 6% loss at 0
  22. spy2jgc

    spy2jgc Member

    I wish they could just change it. Sprint, HTC, or anyone, can charge a battery at more than 4.2 volts... the problem is, the battery can't take more more than 4.2 volts. It's in the chemistry of the battery. If they could get their hands on a battery that can handle 5 volts, they would... unfortunately it's just not technologically possible or feasible with the current technology of liIon. If the battery currently in the phone held twice the capacity and stayed the same size, it would benefit us all... but its not possible. They can double the size of the battery and it will hold twice as much capacity, or they can make a 2 cell battery that can handle 8.4 Volts, but each of those options would double the size of the battery. LiIon/LiPo is cutting edge for cells phones (price per unit, performance, etc.)... at least for the time being. At least we're still not back in the NiCad days, or even NiMH.
  23. Vanquished

    Vanquished Well-Known Member

    From When I got the app to a full charge (Device was at about 50% when I started charging it though):

  24. bathanr

    bathanr New Member

    Wow..I thought I was phone has the same behavior. This is my second replacement as the 1st one locked up very often. I am unable to pinpoint the issue, but I have gone from a full charge to half life in about an hour and yes the phone is hot when this happens. I have noticed this a couple of times while in my pocket.
  25. spy2jgc

    spy2jgc Member


Share This Page