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Posted a second time due to shitty typo.

Posted a second time due to [shitty typo.](https://poal.co/s/Electronics/176668)

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[–] • 0 pt

USB fans are only cooling the outer part of the phone case. The temp inside is still the same.

[–] • 1 pt

According to my testing, it cools down the phone significantly.

The battery temperature sensor shows around 8°C less.

[–] • 2 pts

Depends which phone. Those made out of plastic don’t get the same results.