Question Battery temperature while charging

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TweaknFreak

Senior Member
  • Dec 22, 2014
    91
    20
    Xiaomi Poco F3
    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.
     

    GranoTurc00

    Member
  • Apr 16, 2021
    36
    8
    Xiaomi Poco F3
    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).
     

    blackhawk

    Senior Member
  • Jun 23, 2020
    3,348
    831
    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.
     

    TweaknFreak

    Senior Member
  • Dec 22, 2014
    91
    20
    Xiaomi Poco F3
    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).
    I'll try this with my Poco F1 charger and let you know what I find
     

    TweaknFreak

    Senior Member
  • Dec 22, 2014
    91
    20
    Xiaomi Poco F3
    Ambient here is
    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.
    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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    Reactions: blackhawk

    blackhawk

    Senior Member
  • Jun 23, 2020
    3,348
    831
    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.
    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🤣
     

    TweaknFreak

    Senior Member
  • Dec 22, 2014
    91
    20
    Xiaomi Poco F3
    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.
     

    blackhawk

    Senior Member
  • Jun 23, 2020
    3,348
    831
    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.
    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.
     

    TweaknFreak

    Senior Member
  • Dec 22, 2014
    91
    20
    Xiaomi Poco F3
    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.
    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.
     

    blackhawk

    Senior Member
  • Jun 23, 2020
    3,348
    831
    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.
    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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    • 1
      Ambient here is
      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.
      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.
      1
      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.
      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
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