Samsung unveiled its Galaxy S9 and S9+ at the 2018 MWC, followed by a press conference held in China on March 6th. Regardless of public opinions about the S9 and S9+, you can’t deny that they’re the highlights of 2018 thus far. The new phones’ design is similar to the previous S8/S8+ edition. The S9 and S9+ come with a full Super AMOLED of 5.8 inches and 6.2 inches, respectively, with a 18.5:9 screen ratio.  However, it does have a taller and narrower design with a slightly reduced screen bezels on the top and bottom.
Besides its apparence,  the S9 and S9+ processor is one of the main focuses for the phones. The Chinese version is powered by the Snapdragon 845, but there is also another version with the Exynos 9810 processor. Qualcomm is scheduled to pass the first QC4+ charger certification at the end of last year, but some phones on the market have already adopted the QC4+ fast charge technology. It was rumored that the S9 will also supports QC4 fast charging.

However, the rumors doesn’t seem to be true. The international versions of the Samsung S9 and S9+ continue to incorporate the EP-TA200; a big disappointment to the public. It is understandable though because Samsung’s main strategic advantages have been on smartphone development and not fast charging. Nonetheless, their existing phones already offer wireless charging and AFC fast charging.

We are going to test the S9’s fast charging capabilities with a standard battery capacity of 3000mAh today. According to the EP-TA200 charger parameters, it’s suppose to support both AFC and QC2.0 fast charging. We will mainly look at the charging power and heat dissipation of the charger that comes with the phones.

We conducted the test at a room temperature (24 ℃) using the ChargerLAB POWER-Z KM001. The temperature is measured with a FLIR thermometer. The current and voltage curves of the Samsung S9 original charger test measured by the POWER-Z KM001.The phone was abled to fast charge at 9V with the maximum current at less than 1.2A.  This means that S9 does have about 10W of maximum power.

According to the charging current changes, the Samsung S9 charging process can be divided into two stages. The first stage lasts about a hour and was abled to maintained the charging speed around 10W. After the first hour, the charging current slowly started to decline until the phone was fully charged.

This was a bit surprising when it’s advertised to have 10W fast charging capabilities. But fortunately, the S9 battery capacity is 3000mAh, which means it’ll only takes 2 hours to fully charge the phone; still faster than the iPhone 8.

The temperature increases to 36 ℃ from 28℃ in the first hour of charging when it was charging the fastest. After the peak, the CPU temperature drops down to 29℃; a 8 ℃ difference.

We also conducted a battery life by playing an one hour video. We set the brightness and media volume to the highest level and connected it to the wireless network to play the video at a 720P resolution with no background software running. The battery dropped from full to 89%; we couldn’t help but be a little impress by the battery life.

In conclusion, the Samsung S9 has an input power of 9V while charging, which supports fast charging. However, its maximum power is only 10W, which doesn’t seems very fast for many users.

  • The S9 comes with a standard 3000mAh battery.  Even with 10W of charge power, it only takes 2 hours to fully charged the battery, which is still faster than the iPhone 8.
  • The S9’s heat dissipation is pretty good. The highest temperature during the whole charging process was 36 ℃.
  • Since we only conducted a battery life test for 1 hour, the specific battery lifetime is yet to be confirmed.


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