Lab – Poco F4 GT: 120 W charge that causes slight heat shock

Lab - Poco F4 GT: 120 W charge that causes slight heat shock

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What is the impact of extremely fast 120 W charging on a smartphone? This is what we tried to see in the new Poco F4 GT as well as in 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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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 laboratory tests, starting with those dedicated to recharging. Indeed, the smartphone has an extremely fast charge at 120 W. Enough to allow the F4 GT to recharge very quickly. But what is the impact on its battery and especially on its heating?

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

The Poco model announces that it can regain its full autonomy in 17 minutes with a 4700 mAh battery. This is also announced for the 11T Pro, which, however, has a larger battery (5000 mAh). Note that if the Xiaomi model receives 120 W from the box, this is not the case with our Poco. Its charging speed turns out to be limited by default, without informing the user which power it prefers next. To enjoy these 120 W, you must enable a hidden option in the battery settings. There is also a warning indicating that switching to a full 120 W charge may warm your smartphone a little more.

A 120 W block is imposing compared to a 15 W, but not necessarily more than a 33 or 65 W.

A 120 W block is imposing compared to a 15 W, but not necessarily more than a 33 or 65 W.

Uneven heating

In our experiment, we charged both phones from the level, with the first reaching 100% marking the end of our test (so the Poco F4 GT was the fastest). Every five minutes we photographed the devices using a thermal camera, in order to monitor the evolution of the temperature on the two smartphones. It took a total of 25 minutes.

What we have observed says a lot. During the first 15 minutes of our experiment, we noticed that the Poco F4 GT warmed up all over the surface. Heating observed from the 5th minute and which increased slightly in the next 10. Therefore, the smartphone heats up immediately when it is recharged. This warmth is also felt to the touch – the Mi 11T is actually slightly cooler. The process can be summarized as follows:

  • In 5 minutes, the temperature is already at 33.5 ° C on the USB-C port and the charging cable.
  • The temperature of the F4 GT rises to 34.9 ° C after 10 minutes, at the bottom. Right now, the Poco is therefore the hottest of the two smartphones.
  • At 15 minutes, the entire surface of the F4 GT heats up (red can be seen in the photos), but in the 11T Pro we find the hottest spot: 34.7 ° C at the level of the photo island.
  • After 20 minutes, the heating reaches its maximum in the 11T Pro with 34.9 ° C (what we had at the beginning in the Poco F4 GT). Stabilizes until the end of the test, when the Poco reaches 100% charge.

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

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

Recharging the Poco F4 GT to 120 W, we noticed a slightly more intense heating after 15 minutes (it takes 17 to recover 100%), with 36.8 ° C on top. A local heat release, as it seems that with the load at 120 W, the smartphone heats less evenly. What we do not find when it is restrained.

Heating occurred on the Poco F4 GT after 15 minutes, with full charge at 120 W on.

Heating occurred on the Poco F4 GT after 15 minutes, with full charge at 120 W on.

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

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

What conclusions can be drawn?

First of all, the steam chamber in the Poco F4 GT does not seem to help the smartphone heat up less during charging. The latter is mainly used when playing with the phone, to avoid the inconvenience associated with overheating during long periods of play. However, it does not function as a fan that will cool the smartphone regardless of the circumstances.

Then the Xiaomi 11T Pro seems to manage its heating slightly better, as the latter reaches its peak only after 20 minutes, where the F4 GT knows it from the beginning of the recharge test. A heating that therefore does not look as well controlled in the Poco model as in the Xiaomi. Too bad for a smartphone designed for mobile gamers.

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

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