SOLVED
Howdy Sony'enthousiasts,
I really enjoy my Sony Xperia Z5. It's a great phone! However, it does become hot, especially during a warm summer day while using it intensely or in the sun! Just to be clear, my phone is not over-heating.
The Problem:
The issue is with the battery-life/performane and charging while the device is hot. My phone seems to charge slower and discharge faster when it's hot. Even closing apps, the screen turned off/stand-by and restarting the device don't change this apparent slowdown of battery performance.
The Experiment:
Today my phone was quite hot from intense use. The battery was running low and I started charging it, without great results (just steady heat and a percentage or five increase).
I used a cool damp towel to drain the heat. The towel was a little cooler than the phone. The body of the Z5 is designed to draw the heat from the internals, so my thought was to use the towel for cooling the body of my Z5.
The Result:
To my surprise the phone now being at a normal temperature charged like it always does. The performance improved as well. Of course I was very happy with the results of this cooling down experiment 
My question:
Taking into consideration that;
1. You're not being stupid (throwing the Z5 in a freezer or keeping it under water
2. The temperature difference is not extreme and the glass cracks
Is assisting the Z5 with cooling down bad for the device or battery?
Sony Xperia Support, please share your advice
1 ACCEPTED SOLUTION
Accepted Solutions
@VE_ in my opinion i think this is an alright procedure but i would prefer to let it cool down naturally....but the way you describe it is not too drastic a way of cooling, compared as you mention to some posts i've seen for the complete Z series of phones of putting it in a freezer or droppping it in water, far too sudden a drop of temperature & asking for trouble 
I can't see your way of cooling affecting or damaging anything related to the components of the phone....but to emphasise that is my opinion & not Sonys :smileysmileywink:
@VE_ in my opinion i think this is an alright procedure but i would prefer to let it cool down naturally....but the way you describe it is not too drastic a way of cooling, compared as you mention to some posts i've seen for the complete Z series of phones of putting it in a freezer or droppping it in water, far too sudden a drop of temperature & asking for trouble
I can't see your way of cooling affecting or damaging anything related to the components of the phone....but to emphasise that is my opinion & not Sonys :smileysmileywink:
I was asking myself the same thing.
As today I started water cooling it from the tap. Dunno if it's good ^^ But it works, usually making the temperature go down of 10°c in few seconds.
Was very handy at the beach were the heat and the sun wear making the phone very warm.
And did it just few minutes ago, because my phone was very warm and literally shut down while I was trying to answer you
I guess it should be a progressive cooling ^^
As today I started water cooling it from the tap. Dunno if it's good ^^ But it works, usually making the temperature go down of 10°c in few seconds.
Was very handy at the beach were the heat and the sun wear making the phone very warm.
And did it just few minutes ago, because my phone was very warm and literally shut down while I was trying to answer you
I guess it should be a progressive cooling ^^
I have the answer you need:
The problem: especially when using the phone in direct sunlight, the screen will go super bright, that will provoke a lot of heating coming from the screen plus the heating... From the sun. When the phone is hot the charging is throttled, meaning that to avoid further raising of temperature the charge applied to the battery is lower than regular. It's regulated by the thermal manager on the board. Do you know what happen if a battery goes hot? It explodes you don't want that, right?
The experiment: that works, your phone is waterproof so no damage should happen, however I will prefer a peltier cell rather than a wet towel! So, cooling down the device bring...
The result: a cooler device trigger full power to the battery during the charge process as the risk of damage at regular temperatures is none.
Your question: gradual and not drastic changes in temperature won't affect functionality but drastic and fast ones could. I think a better solution and affordable is to build the dock charger for the Z5 and having a USB fan running behind the device, a geek like me will build a base to let the device resting and charging built with a peltier cell panel, but that's another story.
The problem: especially when using the phone in direct sunlight, the screen will go super bright, that will provoke a lot of heating coming from the screen plus the heating... From the sun. When the phone is hot the charging is throttled, meaning that to avoid further raising of temperature the charge applied to the battery is lower than regular. It's regulated by the thermal manager on the board. Do you know what happen if a battery goes hot? It explodes
you don't want that, right?The experiment: that works, your phone is waterproof so no damage should happen, however I will prefer a peltier cell rather than a wet towel! So, cooling down the device bring...
The result: a cooler device trigger full power to the battery during the charge process as the risk of damage at regular temperatures is none.
Your question: gradual and not drastic changes in temperature won't affect functionality but drastic and fast ones could. I think a better solution and affordable is to build the dock charger for the Z5 and having a USB fan running behind the device, a geek like me will build a base to let the device resting and charging built with a peltier cell panel, but that's another story.
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