I just thought I'd post this as an "FYI", not really looking for feedback or anything.
I received my first Evo 3D through the mail from Sprint on June 23rd, and immediately noticed how warm it got while charging. I AM aware phones get warm when Wi-Fi, GPS, etc. are on, but it was getting VERY warm. Eventually I looked into the voltage the phone was charging at, and it was at 4.385 Volts!
The MAX voltage a LiIon (1 cell) battery can charge at is 4.1/4.2 Volts (depending on quality of cell and if nominal voltage is 3.6 or 3.7). The Evo 3D battery is a 3.7 Volt (Nominal) LiIon battery, as is the battery in the Evo Shift, Evo 4G, and majority of other phones on the market. This means the MAX voltage the battery can take without danger of leakage, bursting, explosion, over-heating and DRASTIC/FAST life span reduction is 4.2 Volts.... not 4.21, 4.3, 4.385. The size of the battery doesn't matter... it can be 1500, 1750, 5000 mah... the max voltage per cell is 4.2 Volts. And this is exactly what my prior phone, the Evo 4G, used to reach and stay at until completely charged.
After playing with the phones settings, switching chargers, and going to lower amp-hour charging rates with no change, I contacted Sprint. I spoke with several representatives, including an "Advanced Technician", who agreed the phone should not be getting as warm as it was (105+ in a 68 degree room) OR charge beyond 4.2 Volts... the phone was obviously broken and a new replacement Evo 3D was Next Day aired to me. It arrived Friday, July 1st.
I plugged the new phone in and several hours later checked it's charge... it was at 97% and hovering in that area (as the 1st Evo 3D had done) and the Voltage was reading 4.350.... not as high as the previous phone, but way too high. It does not dropped below 4.2 Volts until the phone is unplugged and lost 15-20% of it's charge.
This is a huge problem, because I did notice a LARGE reduction in battery life with the previous Evo 3D in only a period of ONE WEEK, because the battery was literally getting cooked. I live in a area with good coverage (3 to 4 bars) and past phones have never had to "work" to get signal. Both Evo 3D's have. Time to call Sprint again, and I did several hours ago.
After describing the issue, I was transferred to another "Advanced Technical" agent. We spoke for awhile, and he did some basic trouble shooting, etc. Eventually what he said was pretty shocking... coming from the mouth of a Sprint Employee... he said he can't believe there hasn't been any "accidents" yet with the Evo 3D's battery heating and charging issues. He said there IS an issue with the Evo 3D over-heating, although no "official" releases or acknowledgements have come from Sprint or HTC because of the limited time the phone has been out, and complaints just starting to come in.
He did not know if it was all of the Evo 3D phones or just a certain percentage of them, but over the past week he spoke to seven other Evo 3D customers, all of them having major issues with the phone getting very hot, some complaining about the battery life getting shorter in addition to the heat. The technician felt it was hardware issue with the phone, and not a software issue. He also commented on a customer who had called in with an Evo 3D, and while the phone was charging in his car, it started power-cycling repeatedly, even when unplugged. He was not able to stop it until pulling the battery, which was almost to hot to handle.
The Technician wasn't able to tell me if there would be a fix or if an Over-The-Air fix is even possible (being that this is not an officially recognized problem AS OF YET, and that it is likely a hardware issue)... but strongly suggested I not let my 30 day return period elapse.
This is no accusation, and I have nothing against Sprint... I've been a customer with them for 9 years, and I think the Evo 3D is a great phone (I really could care less about it's 3D capability... but the rest of the phone is great). I will happily keep the phone if this issue can be resolved... otherwise, I'll have to pull the 4G out of the drawer.
So, that is just my experience. My apologies if I sound defensive in the comments at all.... I just ran into a few other people's comments on the forum who were commenting on the excess heat and the battery life of the phone dropping fast, and many responses they got blamed the OWNER of the phone for the problem (too many apps running, GPS, Wi-Fi and/or 4G running with other combos, etc.) I don't want to hear negative responses.... I'm just putting this out there so the problem with the phone can be addressed.
Good luck... and if you have any doubts, check your phones voltage, and then check out the chemistry of LiIon/LiPo cells. I've worked and played with these battery cells for years, and believe you'll be experiencing the same problems if your BATTERY is getting more than 4.2 Volts (The chargers put out 5 or more volts to the PHONE.... the phone should only allow 4.2 of those volts to reach the phone).
And one last thing... this occurs with the supplied HTC charger, as well as previous HTC chargers, and aftermarket chargers with lower amperage that I've tried. I took the battery out of the phone and charged it on a digital charger at 4.2 Volts..... it stayed cool and took a full charge.
Last edited by EarlyMon; July 5th, 2011 at 10:16 PM.
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The second day I had this phone I went to a movie and had 90 percent battery. I had everyting turned off that saves battery. The phone got really hot and battery dropped to 24 percent by the time the movie was over. Any idea what happened???
My battery life is terrible. Just fully charged it and within 1 hour 20 min I've dropped 30%. This is with one phone call. I checked weather radar online and a few texts. My phone also gets hot. It gets at at the top of the phone where your ear would go on a call.
If it's heating up that much when you aren't using it, then it's either doing some major data communications or the processor is working on something and keeping your phone from sleeping. Might try uninstalling potentially problematic apps (or check with others with the same app and see if they're having similar issues). CPU cycles and whatnot turns into heat.
The second day I had this phone I went to a movie and had 90 percent battery. I had everyting turned off that saves battery. The phone got really hot and battery dropped to 24 percent by the time the movie was over. Any idea what happened???
You need to post what temperature the phone got to and what radios you had turned on. Sure you didn't leave the screen on and place the phone in the holster?
My battery life is terrible. Just fully charged it and within 1 hour 20 min I've dropped 30%. This is with one phone call. I checked weather radar online and a few texts. My phone also gets hot. It gets at at the top of the phone where your ear would go on a call.
Did you have 4G or WiFi on during the call? That's your problem.
I live in a non 4G area, and 3G coverage is great where I am. I wasn't at home so my WiFi was turned off
If your phone drops 30% while on a call its either
A: Your proximity sensor isn't turning the screen off during a call.
B: You are in a bad coverage area
C: You have an app running in the background of which you need to close for Force Stop.
Did you pull your phone off the charger as soon as the light turned green or was the phone sitting on the charger of which you unplugged the phone and left the house? If you unplugged the phone and did not plug it back in your phone wasn't fully charged in the first place.
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Classic runaway app syndrome...
When I feel my phone start heating up I open task killer first and see if something is running that shouldn't, and if I don't see something obvious I do a restart. Also if you recently installed something weird uninstall it.
My battery goes all day and only uses about 75-80%.
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FYI this happens on my Evo 4G sometimes (running CM7). There is a known issue with the Evo 4G that sometimes it does not go to sleep, even when you press the power button to turn off the screen.
When this happens I restart the Evo and all is well again.
I wonder if the same bug is still resident in the Evo 3D.
If your phone drops 30% while on a call its either
A: Your proximity sensor isn't turning the screen off during a call.
B: You are in a bad coverage area
C: You have an app running in the background of which you need to close for Force Stop.
Did you pull your phone off the charger as soon as the light turned green or was the phone sitting on the charger of which you unplugged the phone and left the house? If you unplugged the phone and did not plug it back in your phone wasn't fully charged in the first place.
I wasnt on a 30 minute call. It was a 5 minute call. The proximity sensor works fine, and I'm in a great coverage area. Maybe It's something running in the background but I doubt ir. I'm anal about making sure I close apps out when I'm done. I dont know, maybe I have a bad battery.
This phone gets noticeably hotter then the HTC incredible or evo from my experience.
Probably because of the bigger battery. Problem is when it gets hot things like gps don't seem to work very well and battery drains quicker.
Interesting findings (referring to first post before thread merge). I'm still in the process of digesting all your info but I wonder if PC USB port charging would be any different than wall charging in this situation?
Last edited by PyroSporker; July 5th, 2011 at 10:20 PM.
Interesting indeed. I just checked my Evo - it's charging at 4.2 V, if I'm to believe System Panel.
My 3vo got very hot charging last night - that comes and goes - but as mentioned in another thread - I could have had a minor scalding to my ear, I took a call while it was hot. That was on the 1A wall charger. I noted at the time that it was 103 degF per System Panel.
Just checked my 3vo - System Panel said charging from 4.28 to 4.31 V but the battery is cool now at 88.7 degF - that was USB charging at 0.5A from my laptop.
Now that I think about it - it has gotten hot every time I've used the wall charger - but pretty sure never while USB laptop charging.
Interesting indeed.
I have retitled this, added a poll, removed the prefix - and made this a sticky thread.
In my opinion - this is serious.
Last edited by EarlyMon; July 5th, 2011 at 10:27 PM.
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I've been charging my E3D for the past hour on the wall charger, but I usually turn it off. It's cool now. Maybe, having it on and using a wall / car charger makes a difference.
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Only once since I had my phone did I notice it got hot. It was plugged into the wall with the original charger that came with the phone. I had a live wallpaper running and I noticed it getting hotter than normal but then it cooled down. I don't remember if I turned off the live wallpaper or not I am guessing I thought that was causing the problem and did. But I haven't noticed it being hot ever again.
After hearing about this thread, I started to charge my Evo 3D with the supplied wall charger + cable. Starting battery charge was about 28%. After an hour, the phone is reading 4128mV and 36.5 degrees C. Current charge is 68%. Phone feels a bit warm on the back, but nothing abnormal.
Looks like mine is ok with wall charging. I will test usb charging tomorrow, since I do remember the back glass feeling unusually hot once.
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mine tends to get warm when doing anything particularly intensive, but not any more than any of my old smartphones
charging via USB at the moment at 3.85 Volts, nice and cool
battery life is pretty crappy though, I guess that could be my fault, not really an issue since 90% of my time is spent in front of a computer and I keep my charger with me all the time
I use Battery Indicator Pro. It has a temperature alarm in the settings menu. I set my alarm for 104 degrees F. My alarm has gone off using both the HTC OEM wall charger and the usb cord, none OEM, from my computer. I have a OtterBox Commuter case on my phone and you can feel the heat through it. It has not affected my battery life yet.
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!
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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.
If the tools you use indicates voltage when charging, please post that info along with temperature - cheers, thanks!
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.
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I have elixer and my phone says 34.0 C and voltage 4196mv is that normal my phones not hot. Only felt hot once since I've had it.
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.
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"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).
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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!
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.
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)
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Interesting findings (referring to first post before thread merge). I'm still in the process of digesting all your info but I wonder if PC USB port charging would be any different than wall charging in this situation?
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.
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)
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.
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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?).
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Last edited by Vanquished; July 6th, 2011 at 05:33 AM.
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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.
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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.
Last edited by EarlyMon; July 6th, 2011 at 05:32 AM.
Is it the Voltage.... or is it just naturally warm?
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.
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.
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.
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.
Last edited by spy2jgc; July 6th, 2011 at 06:46 AM.
Reason: Clarification
Wow..I thought I was crazy..my 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.
It doesn't say the voltage anywhere. I'm assuming it's anout where it should be based on the temperature of the battery.
I'll watch some movies and play some games and then use the wall charger and see what I get.
Very good... heat and decreasing battery are symptoms of high voltage, but so are many other things. They are just symptoms, which it sounds like you don't have. Checking voltage is just a fast and easy way to rule out if it's a voltage problem if you are experiencing symptoms. If your phone is running well and you aren't experiencing any issues or concerns, that is good. It wasn't clarified if the voltage issue was a problem with a small amount of Evo 3D's or many... I guess we won't know until/if it is acknowledged...
If you concerned, check the voltage... there isn't a grey area with the reading... you are either over voltage or normal. Doesn't hurt to check, but don't worry about it if you don't feel you have to, that is my opinion.
My phone didn't run hot all the time, just a lot of the time, and it came and went. So I started trouble shooting, turning off all radios, gps, apps, etc., and eventually checked the voltage. It was just a fast and easy way to find the source of the problem. Sounds like you aren't experiencing symptoms, and are trouble free though?
When I posted my original comments, I didn't want anybody to freak or jump to conclusions or panic (not that you are).... just to know if they were experiencing heating and/or battery issues, voltage WILL cause that, and it's one of the easiest things to eliminate from your list by simply checking. Hopefully it's just a small number of phones, and not a widespread issue.
Sprint continues their EVO line of Android Phones with what is certainly a first for them - a 3D phone. The HTC EVO 3D boasts 3D technology on a beautiful 4.3-inch screen and get this: you don't even need glasses to enjoy the 3D experience!
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HTC Evo 3D Voltage/Heat Issues
Handset felt warm..batterly life reduced quickly.
