Lab – Poco F4 GT: a 120 W charge that gives small heat strokes

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What is the effect of ultra-fast charging at 120 W on the heating of a smartphone? This is what we tried to see on the new Poco F4 GT as well as on the Xiaomi 11T Pro.

Poco F4 GT


Poco F4 GT

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Xiaomi 11T Pro 5G


Xiaomi 11T Pro 5G

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This is how the price table works

Just announced, the Poco F4 GT is already in our hands. Its promising technical sheet requires us to compare it with our lab tests, starting with those dedicated to recharging. The smartphone has ultra-fast charging at 120 W. Enough for the F4 GT to refuel very quickly. But what is its impact on the battery and especially on its heating?

The new Poco F4 GT is not the first smartphone from Xiaomi to benefit from super-fast charging at 120 W. The Xiaomi 11T Pro was the first to offer a giant charging block when it was released in the fall of 2021, and we had measured its power on the occasion of a dedicated article.

The Poco model announces that it can regain its full autonomy in 17 minutes with a 4700 mAh battery. This is what is also announced for the 11T Pro, which, however, has a larger battery (5000 mAh). Note that if the Xiaomi model accepts a power of 120 W out of the box, this is not the case with our Poco. Its charging speed turns out to be limited by default, without it being specified to the user which power is then preferred. To enjoy these 120 W, you need to enable a hidden option in the battery settings. A warning is also displayed indicating that switching to a full 120 W load may heat up your smartphone a little more.

A block of 120 W is impressive compared to one of 15 W, but not necessarily more than one of 33 or 65 W.

A block of 120 W is impressive compared to one of 15 W, but not necessarily more than one of 33 or 65 W.

Uneven heating

In our experiment, we charged both phones from the flat, with the first one reaching 100% signaling the end of our test (so the Poco F4 GT was the fastest). Every five minutes, we took a picture of the devices using a thermal camera, to follow the development in the temperature of the two smartphones. All in all, it took another 25 minutes.

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What we observed is telling enough. During the first 15 minutes of our experiment, we noticed that the Poco F4 GT was heated all over the surface. A warming that can be observed from the 5th minute and which increased slightly during the next 10. The smartphone therefore warms up immediately when it is recharged. This heating is also felt by touch – the Mi 11T is actually a bit colder. The process can be summarized as follows:

  • In 5 minutes, the temperature is already at 33.5 ° C at the USB-C port and the charging cable.
  • The temperature of the F4 GT rises to 34.9 ° C after 10 minutes on its lower part. At present, therefore, the Poco is the hottest of the two smartphones.
  • After 15 minutes, the entire surface of the F4 GT is heated (the red is visible in the pictures), but it is on the 11T Pro that we find the hottest point: 34.7 ° C at the level of the photo island.
  • After 20 minutes, the heating reaches its maximum on the 11T Pro with 34.9 ° C (what we had at the beginning of the Poco F4 GT). It is stabilized until the end of the test when the Poco reaches 100% charge.

Left, Poco F4 GT;  right, Xiaomi 11T Pro.  In order: the heating temperatures recorded at 5, 10, 15, 20 and 25 minutes.

Left, Poco F4 GT; right, Xiaomi 11T Pro. In order: the heating temperatures recorded at 5, 10, 15, 20 and 25 minutes.

By recharging the Poco F4 GT at 120 W, we noticed a slightly more marked warm-up after 15 minutes (it takes 17 to regain its 100%), with 36.8 ° C on its upper part. A local emission of heat, as it seems that with the load of 120 W, the smartphone heats up less evenly. What we do not find when it is mastered.

The heating noted on the Poco F4 GT after 15 minutes, with full load at 120 W activated.

The heating noted on the Poco F4 GT after 15 minutes, with full load at 120 W activated.

The battery reaches its hottest point (44.6 ° C) after 10 minutes of charging at 120 W. © Displays.

The battery reaches its hottest point (44.6 ° C) after 10 minutes of charging at 120 W. © Displays.

What conclusions can be drawn?

Firstly, it does not appear that the steam chamber of the Poco F4 GT helps the smartphone heat up less during charging. The latter is mainly used when playing with the phone, to avoid the inconvenience associated with excessive heating during long gaming sessions. However, it does not work as a fan that would cool the smartphone no matter the circumstances.

Then the Xiaomi 11T Pro seems to cope with its warm-up a little better, as the latter only reaches its peak after 20 minutes, when the F4 GT is familiar with it from the start of its recharge test. A warm-up that therefore does not seem as well controlled on the Poco model as on Xiaomi. A shame for a smartphone designed for mobile gamers.

In any case, this heating (below 37 ° C) is neither incredible nor exceptional. You do not have to worry about it more than common sense. Fortunately, it remains quite similar to what we find on other smartphones in the market.

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