Develop Bugs

[Q] Battery voltage?

I'm wondering what the normal ranges for the battery voltage on the Epic are.
I ask because as the phone's charge drops, the screen begins to exhibit unusual bars flickering across when at full brightness (and displaying mostly white).
From what I can tell, it's caused by the display not receiving enough power to keep all the pixels on full white, and this theory is somewhat backed up by watching the battery voltage drop before the bars start showing up.
When fully juiced up, it runs at around 4-4.2v, but when it gets lower (below 40 or 50 even) it drops well below 4v, down to around 3.5v.
I've always wondered if I had a bad battery (since it seems to lose charge even when plugged in), and if my voltages are really out of whack, I guess my suspicions are confirmed and the battery is defective.

s84471 said:
When fully juiced up, it runs at around 4-4.2v, but when it gets lower (below 40 or 50 even) it drops well below 4v, down to around 3.5v.
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I will check my voltages throughout the day and let you know what I get. I've had my phone for just under a year now and it gets pretty heavy usage. My battery voltage when plugged in at 100% charge is about 4.1V according to Spare Parts.

Didn't the epic come out on 8/31/10? If so that's not even close.to a year.its like half a year
Blankrubber said:
I will check my voltages throughout the day and let you know what I get. I've had my phone for just under a year now and it gets pretty heavy usage. My battery voltage when plugged in at 100% charge is about 4.1V according to Spare Parts.
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Sent from my Evo Killer!!!

musclehead84 said:
Didn't the epic come out on 8/31/10?
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Yeah, I'm an idiot. I've had it since launch.
Unplugged stats for the day:
Battery 100% -> Voltage 4.1V
Battery 50% -> Voltage 3.8V
Battery 30% -> Voltage 3.75V
These are just my readings for reference.

Blankrubber said:
Yeah, I'm an idiot. I've had it since launch.
Unplugged stats for the day:
Battery 100% -> Voltage 4.1V
Battery 50% -> Voltage 3.8V
Battery 30% -> Voltage 3.75V
These are just my readings for reference.
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Hmm, about on par with what I've been seeing.
When your battery is down at around 30%, and the brightness is maxed, does the screen distort in any way when displaying almost entirely white? (I notice it when firing up Dolphin and loading Google).

s84471 said:
Hmm, about on par with what I've been seeing.
When your battery is down at around 30%, and the brightness is maxed, does the screen distort in any way when displaying almost entirely white? (I notice it when firing up Dolphin and loading Google).
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Well, not that I've noticed. I sometimes run an app called Screen Filter to apply a dark overlay to the screen to dim in when I'm on my phone in a dark room, and occasionally I'll see quick flickering verticle lines of pixels that seem to pulse in a random fashion against a white background. I would say that's just my screen filter, though, because I've never seen it unless it's on.
Next time my battery's < 30% I'll try it out and report back.

HTC 10 overcharging?

Hi. Please excuse my English. My HTC 10 remains warm as long as it is plugged in, that is, even several hours after the green led started to flash. All my previous phones aborted the charging process and cooled down after the battery was fully charged (Of course, I use the bundled charger). This is very concerning. Does it mean that the phone overcharges? I always turn my devices off before I plug them in and begin to charge them. Thanks.

I think this pretty normal. What means warm to you? 40degrees celsius on charger is normal for this device. It does not matter if you charge while turned off as the quickcharge technology works either way and will not quick charge after reaching 80% load. I recently read an article of someone who charged his 10 with an google pixel c charger ( usb c 5v, no quick charge). His 10 loaded normally until 100% but charging procedure did not stop and phone shut down after reaching 50degrees battery temp... maybe your charger is faulty!? How fast does it charge?

I can tell you that my phone tends to get warmer (keep in mind I said warmer, not hotter) when it is plugged in and I am doing stuff (Youtube, browsing, etc...). It will most likely keep warm unless you are not doing anything. I try to not charge my phone overnight since I usually get up to go to the bathroom or get water in the middle of the night, and since I only got like 2-3 hours of sleep left that's when I plug my phone in. You say you turn your phone off when your phone is charging so I'm unsure why it would get hot.

Clarifications
Thank you very much, xperia x root.
By "warm" I mean that the actual phone (not the charger) is above room temperature, unlike any of my previous phones, indicative of redundant electrical activity, which, to my fear, might be overcharging. This is why I wrote that I turn my device off before I charge it: it means that the phone does not consume power, and thus that there is no charging-discharging routine going on. I am yet to measure my phone's charging time.

There's really no need to turn off your phone every time you charge it. My phone gets slightly warmer when quick charging compared to using the regular charger from my previous M9. If you Google "overcharging cell phone", you'll find so many articles about how it's a myth because the phones are smart enough to know when to stop taking a charge when it's completely full.

Tapirus Morris said:
Thank you very much, xperia x root.
By "warm" I mean that the actual phone (not the charger) is above room temperature, unlike any of my previous phones, indicative of redundant electrical activity, which, to my fear, might be overcharging. This is why I wrote that I turn my device off before I charge it: it means that the phone does not consume power, and thus that there is no charging-discharging routine going on. I am yet to measure my phone's charging time.
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Yeah i meant the phone too. This phone is always above room temp . Nothing to worry about. While Im typing here(chrome desktop modus) my device battety temp is 40degrees. While using phone during charging it even gets 46 degrees warm, before throttling very hard. I'll watch temp today when charging after reaching 100% and post my temp.

xperia x root said:
Yeah i meant the phone too. This phone is always above room temp . Nothing to worry about. While Im typing here(chrome desktop modus) my device battety temp is 40degrees. While using phone during charging it even gets 46 degrees warm, before throttling very hard. I'll watch temp today when charging after reaching 100% and post my temp.
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Thanks, xperia x root. When the phone is off, it should, eventually, reach room temperature. That's why I fear that my phone's warmth indicate overcharging. I completely understand that it is unnecessary to turn the phone off while charging, but if it is on, you just cannot know if the heat is due to overcharging, or some operation of the processor. This is why it would be most helpful if you would, only once, for the sake of our experiment, charge your HTC 10 today while it is turned off. And I think you shouldn't watch the temperature, but simply touch it with your hand and feel if it is in room temperature or not. And it would be very helpful if you examine the phone's warmth sometime after the green light is on -- one hour, for example -- to be sure that the phone had enough time to cool down. Thank you very much!

xperia x root said:
Yeah i meant the phone too. This phone is always above room temp . Nothing to worry about. While Im typing here(chrome desktop modus) my device battety temp is 40degrees. While using phone during charging it even gets 46 degrees warm, before throttling very hard. I'll watch temp today when charging after reaching 100% and post my temp.
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My HTC 10's charging time looks normal, on par with what you see and hear from other consumers and reviewers : it took 1:33 hr to reach 100% from 10%.

whats your battery temperature?

guys, i need some feedback from you regarding your battery temperature. i feed like mine gets too hot on the replacement device - but i dont have the exact values from my previous unit. im talking idle temp (phone sitting with screen off on the desk for like half an hour at least) and screen on time with normal browsing/navigating usage and outside temps of around 25°C.
thanks a lot!

Another post about heating

Hi guys. I've searched every post about heating problems but I have a question about S20/S20+.
When I use it for basic stuff like Facebook and whatsapp, my phone battery temperature gets 35c after a few minutes. If I open intensive cpu apps, it raises to 39, 40. I am using Ampere app to monitor.
Is that normal? Do I have to worry about it? I live in Brazil and ambient temperature inside my house is 27c.
Can you share your battery temp here after using the device for a while?

35c to 45c is well within the thermal limits of your device. Naturally if you live in a tropical area the ambient temperature is going to be higher and thus would have a negative impact on the device's temperature.

Revontheus said:
35c to 45c is well within the thermal limits of your device. Naturally if you live in a tropical area the ambient temperature is going to be higher and thus would have a negative impact on the device's temperature.
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Just realized that if device hits 40c Celsius, it automatically turns off 120hz. Just happened with me. If I use camera for more than 15 minutes, it hits 40

goTouch said:
Just realized that if device hits 40c Celsius, it automatically turns off 120hz. Just happened with me. If I use camera for more than 15 minutes, it hits 40
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That's normal. I'd be more worried if the device didn't do that automatically. Prolonged camera usage (esp 4k) causes a lot of devices to heat up regardless of the brand.

Question Battery temperature while charging

Hi. I have the Indian version of the device, which is Mi 11x 6|128GB variant. I noticed while charging, Accubattery shows battery temps of 45 46 degrees Celsius (113 Fahrenheit). I find that not normal for a new phone. I'm coming from a Poco F1 which had a SD845, so here are my doubts:
1. Does all flagship class SoCs heat up that much during charging? But my Poco F1 didn't.
2. Is there something wrong in my unit or is it faulty cooling implementation on the entire Redmi K40 lineup?
3. Can I expect this issue to become a little less in the future after some updates to alter SoC clock speed or something?
Thanks for reading.

Thats normal if you use the included 33W charger, the battery naturally heats up while charging, the fatest you charge the battery the more heat it produces. is always recommended to not heavily use the phone while in charge. just for the sake of doubt you can try use a 5W charger and see if it heats up while charging slowly, (it should be hot just a little).

What's the ambient temperature?
Is it fast charging? Which typically produces a,fair amount of waste heat.
If it's start temperature is 99F it will climb into the triple digits.
You want the battery to be above at least 72°F at charge start to prevent the possibility of Li plating.
While it may be normal for this phone, you are beating the battery. It's been reported that high temperatures during fast charging can promote Li plating.
Cool it once it reaches 99F, with a fan and/or a damp microfiber cloth.
On my Samsung it will stop charging if it goes above about 102F. Samsung tends to be conservative with their charging parameters.
Not a bad thing as it lengthens battery lifespan and reduces the chances of a thermal runaway event.

GranoTurc00 said:
Thats normal if you use the included 33W charger, the battery naturally heats up while charging, the fatest you charge the battery the more heat it produces. is always recommended to not heavily use the phone while in charge. just for the sake of doubt you can try use a 5W charger and see if it heats up while charging slowly, (it should be hot just a little).
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I'll try this with my Poco F1 charger and let you know what I find

Ambient here is
blackhawk said:
What's the ambient temperature?
Is it fast charging? Which typically produces a,fair amount of waste heat.
If it's start temperature is 99F it will climb into the triple digits.
You want the battery to be above at least 72°F at charge start to prevent the possibility of Li plating.
While it may be normal for this phone, you are beating the battery. It's been reported that high temperatures during fast charging can promote Li plating.
Cool it once it reaches 99F, with a fan and/or a damp microfiber cloth.
On my Samsung it will stop charging if it goes above about 102F. Samsung tends to be conservative with their charging parameters.
Not a bad thing as it lengthens battery lifespan and reduces the chances of a thermal runaway event.
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Ambient here is 86 Fahrenheit and above. While charging the phone, I don't even use it. I just put it face down on the screen so that the heat dissipation is faster from the back surface. But still it reaches those temperatures and is making me doubt the QC process of Xiaomi in this case.

TweaknFreak said:
Ambient here is
Ambient here is 86 Fahrenheit and above. While charging the phone, I don't even use it. I just put it face down on the screen so that the heat dissipation is faster from the back surface. But still it reaches those temperatures and is making me doubt the QC process of Xiaomi in this case.
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It may dissipates more heat through the display.
Never use a phone while charging as it skews the charge cycle parameters.
Simply cool as I described or don't use fast charging.
You can also use partial charge cycles like 40-60%. That's also part of the range the battery pulls high current and heats up.
If I see my battery temp climb above 100F I will stop the charge and hit it up a little latter.
For my Samsung the optimum battery temp range for fast charging is 85-100F. Outside of that range fast charging may not always engage or stay engaged. However in that ambient temperature range I need to some form of cooling when fast charging if I want to maintain a temperature under 100F.
Always keep an eye open for case swelling which indicates a battery failure. Replace it immediately if that happens.
It becomes more likely as the battery ages or if exposed to temperature/current extremes. I just replaced a failed battery at the 1.5 year mark on my Note 10+.
Fun, isn't it

I just checked the charging with my Poco F1 charger which is 18W. The portion just below the camera module heats up the most. And the temperature between charging with the 33W charger and 18W poco charger are same. At least that's what Accubattery says. I'm replacing this device for sure, let's see how the replacement device works out.

TweaknFreak said:
I just checked the charging with my Poco F1 charger which is 18W. The portion just below the camera module heats up the most. And the temperature between charging with the 33W charger and 18W poco charger are same. At least that's what Accubattery says. I'm replacing this device for sure, let's see how the replacement device works out.
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If the temperature is the same than it's not fast charging. Fast charging generates much more heat however even while it's enable the charge rates vary due to temperature, charge state and battery condition.
For instance between 80-100% the charge rates will be about the same. This may start as low as at 70% or even lower if the charging parameters aren't optimum.
The easiest way to tell is with an app like Accubattery. Put it on the charge page then use the power button to turn off the screen. Start charging. You have about a second if you turn the screen on to see the screen off charging milliamp figure. The charging log also tells what was happening but not when it happened in the charging cycle.
At maximum rate mine tops out at around 5200 ma using a 25 w brick. It varies between 1700- 5200 until it starts ramping down as the cell nears a full charge.
Nearing 90-100% it may be 800 ma or lower.

blackhawk said:
If the temperature is the same than it's not fast charging. Fast charging generates much more heat however even while it's enable the charge rates vary due to temperature, charge state and battery condition.
For instance between 80-100% the charge rates will be about the same. This may start as low as at 70% or even lower if the charging parameters aren't optimum.
The easiest way to tell is with an app like Accubattery. Put it on the charge page then use the power button to turn off the screen. Start charging. You have about a second if you turn the screen on to see the screen off charging milliamp figure. The charging log also tells what was happening but not when it happened in the charging cycle.
At maximum rate mine tops out at around 5200 ma using a 25 w brick. It varies between 1700- 5200 until it starts ramping down as the cell nears a full charge.
Nearing 90-100% it may be 800 ma or lower.
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But 45 degrees Celsius is not normal for a new device dont you think? I mean if it was 65W charging I'd say maybe it can get a little toasty but for 33W I'm sceptical.

TweaknFreak said:
But 45 degrees Celsius is not normal for a new device dont you think? I mean if it was 65W charging I'd say maybe it can get a little toasty but for 33W I'm sceptical.
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If that's the battery temp, it's high. The CPU can easily run beyond that though.
If the whole phone feels hot you got issues.

blackhawk said:
If that's the battery temp, it's high. The CPU can easily run beyond that though.
If the whole phone feels hot you got issues.
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It's generally the back portion of the phone specially the part below the camera module. I'm getting the device replaced tomorrow. Let's see what happens