Lab – Poco F4 GT: a 120 W charge that provides low heat stroke

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

Little F4 GT



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How the pricing table works

Recently announced, the Poco F4 GT is already in our hands. Its promised technical sheet requires that it be compared to our laboratory tests, starting with those dedicated to recharging. In fact, the smartphone has an ultra-fast charging of 120 W. That’s enough to allow the F4 GT to refuel immediately. But what effect does this have on his battery and especially on heating it?

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

The Poco model is announced to be able to regain full autonomy within 17 minutes with a 4700 mAh battery. This is also announced for the 11T Pro, which nonetheless has a larger battery (5000 mAh). Note that if the Xiaomi model receives 120 W power out of the box, this is not the case with our Poco. Its charging speed is limited by default, without telling the user which power is preferred. To enjoy this 120 W, you need to activate a hidden option in the battery settings. A warning indicating that switching to a full 120 W load may heat up your smartphone a bit as is also shown.

A block of 120 W is much larger compared to one of 15 W, but need not be more than one of 33 or 65 W.

A block of 120 W is much larger compared to one of 15 W, but need not be more than one of 33 or 65 W.

Uneven heating

In our experiment, we charged both phones from flat, with the first reaching 100% signaling the end of our test (so the Poco F4 GT was the fastest). Every five minutes, we take a picture of the devices using a thermal camera, to follow the temperature evolution of the two smartphones. In total, 25 minutes are required.

What we have observed is enough to say. During the first 15 minutes of our experiment, we noticed that the Poco F4 GT heats up the entire surface. A warm-up is visible from the 5th minute and that increases slightly in the next 10. So the smartphone heats up immediately when it is recharged. This warmth is also felt to the touch – the Mi 11T is actually quite cool. The process can be summarized as follows:

  • In 5 minutes, the temperature is already at 33.5 ° C on the USB-C port and on the charging cable.
  • The temperature of the F4 GT rises to 34.9 ° C after 10 minutes, in its lower part. This season, the Poco is the hottest of the two smartphones.
  • In 15 minutes, the entire surface of the F4 GT was heated (the red seen in the photos), but it was on the 11T Pro that we found the hottest point: 34.7 ° C at island level in the photo.
  • After 20 minutes, the warm -up reached its highest on the 11T Pro with 34.9 ° C (what we had at the start of the Poco F4 GT). It is confirmed until the end of the test, when Poco reaches 100% charge.

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

By recharging the Poco F4 GT to 120 W, we noticed a slight warm-up mark after 15 minutes (it takes 17 to recover 100%), with 36.8 ° C on its high side. A local heat release, because it seems that at a load of 120 W, the smartphone is not very evenly heated. What we can’t see if it’s suppressed.

The heating seen on the Poco F4 GT after 15 minutes, with the full load of 120 W is activated.

The heating seen on the Poco F4 GT after 15 minutes, with the full load of 120 W is activated.

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, the vapor chamber present in the Poco F4 GT doesn’t seem to help the smartphone heat up a bit when charging. The latter is usually used when you play on the phone, to avoid the inconvenience associated with overheating during long gaming sessions. However, it does not act like a fan that can cool the smartphone no matter what. condition.

Then, the Xiaomi 11T Pro seems to manage to heat it up better, as the latter only reaches its peak after 20 minutes, which the F4 GT is familiar with from the start of trying to recharge it. A heating that is therefore not as controlled on the Poco model as the Xiaomi. A shame for a smartphone designed for mobile gamers.

In any case, this heating (below 37 ° C) is not unusual or unusual. You don’t have to worry about it more than cause. Fortunately, it remains similar to what we’ve seen on other smartphones on the market.

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