My smartphone (Sony Xperia Z5) gets very hot while recording 4k video (around the CPU area). Is there anything I can use to keep it cool?
I don't want to put anything on directly on the phone, but I'm hoping to incorporate something into the case.
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I would try this. Usually before I use it over my eyes. I refrigerate it for some time. After the gel is cool enough, you could stick it on the back of the phone. This will cool the phone down.
Set up a fan to blow air over it while you are recording. This will help to alleviate some of the heat issues.
If you have a case on the phone, remove it to assist with the heat exchange from the air. Cases tend to act like insulation when it comes to heat.