Samsung Galaxy S8 and S8+ Duos Review

8 May 2017, 03:55:26

Samsung Galaxy S8 and S8+ Duos Review
The review units have been provided by Etoren.com

Battery

The first option from the Device maintenance settings regards the battery. This section of the service gives you information about the current status of the accumulator - the percentage of capacity, estimated battery life and battery usage data. It also learns from your usage patterns. There are two power saving modes and an off option, too. Both modes are pre-set, but you can customise them to suit you better. The App monitor detects apps that drain the battery from the background, so you can put them to sleep if you need more battery juice. Besides that, you can also create a list of unmonitored apps to save them from being put to sleep by the App monitor. They can use as much power as they need. You can also turn on Optimize battery usage for individual apps.
The Galaxy S8 is equipped with a 3000 mAh Li-Pol battery, while the Galaxy S8+ packs a 3500 mAh accumulator. Both are coupled with a 5V/2A; 9V/1.67A fast charger and Qi/PMA wireless charging (the wireless charger is sold separately). All battery tests we run here are developed by us and performed with the screen of the device being calibrated to 200 cd/m2. Battery saving features are disabled. In this specific case, the solid green line depicts the charging/discharging process of the S8 and the dotted green line displays its battery temperature. The corresponding lines in red apply to the S8+ charging/discharging process and battery temperature. All tests show an admirable battery life. It's been very interesting to observe the almost identical patterns of charging and battery temperature development of both smartphones despite that they have different capacities. Both smartphones manage to reach 50% of their capacity in 40 minutes. Full capacity for the S8 is reached in 1 hour and 35 minutes, while for the S8+ it needs 4 minutes more - 1 hour and 39 minutes. Till 30% of the capacity is reached, the charging rate of both smartphones is one and the same. After that point, the charging of the S8+ slows down only very slightly and this trend becomes more visible when 40-50% are reached. At around 80%, the two devices slow down the charging process and this happens more significantly after they reach 90% of their capacity. The battery temperature of the S8 starts at 32°C and the one of the S8+ begins at 31°C. Both rise gradually till they reach 34-36°C after the first 20 minutes. From that moment on, the battery of the S8+ tends to become slightly hotter than the one of the S8. The respective levels of the two are 36-38°C and 34-37°C and are maintained till 80% of the capacity is reached. At that moment with the slowing down of the charging, both temperatures start to decrease in an almost perfect harmony. The browsing battery test also shows interesting insights. The 3500 mAh battery provides 19 minutes of battery life more than the 3000 mAh one. The S8 drains in full after 7 hours and 10 minutes. The S8+ depletes in full after 7 hours and 29 minutes under the same conditions. It is obvious from the very beginning that the discharging rate of the S8+ is slower than that of the S8, but the differences are minimal. They become more significant when both devices reach 50% of their battery capacities. At the very end of the process, the graph becomes less steep. This reflects the fact that when the smartphones reach 5% of the battery capacity their displays are automatically dimmed. This is a built-in behaviour pattern and you cannot change it from any settings. At the same time, the temperature fluctuations of the S8 and S8+ are entirely equal. They start at 30°C and after 30 minutes reach 34-35°C. This level is maintained till the batteries reach 5% of their capacity. At that point, the temperatures drop to 32°C. For the battery life test during video playing, we use a 1080p video at 30 fps with a ~20Mbps rate. Here the differences between the two smartphones are more significant. Galaxy S8 shows a result of 11 hours and 58 minutes, while the S8+ battery lasts for 13 hours and 54 minutes - almost 2 hours more. The discharging pattern at the end is the same as the one observed in the browsing test and the reason for that is the same one, too - at 5% of the battery capacity, the displays are automatically dimmed. It's obvious that video playing does not put excessive strain on the battery and both devices maintain a steady and healthy battery temperature of around 30°C from the start until the end. We have also tested the two devices with a 2160p video at 30 fps with a ~55Mbps rate. The Galaxy S8 lasted for 9 hours and 21 minutes, which is 2 hours and 37 minutes less when compared to the 1080p video test result. The Galaxy S8+ held up for 10 hours and 54 minutes, which is exactly 3 hours less than its result on the 1080p video test. The discharging pattern is almost the same reflecting the screen dimming at 5% of the capacity. As long as it concerns the battery temperature, the graph is identical to the one from the 1080p video test. The temperature of both batteries stays almost the same from the start until the end - 30-31°C. For the 3D Graphics/Gaming test, the Epic Citadel's tech demo in its Guided Tour mode is used. The S8 and S8+ results are more on par here. The smaller battery lasts for 4 hours and 33 minutes, while the 3500 mAh accumulator makes a total of 5 hours. The battery discharging pattern is already known from the previous tests. The battery temperature levels are one and the same for both smartphones. The temperature starts from 30°C and for the first 30 minutes gradually rises to 40°C. This level is maintained until the very end.

Final thoughts

The Galaxy S8 and S8+ are the epitome of refinement in mobile technology. They are quite unobtrusive and it does take time and getting to know them in order to appreciate these works of high-tech art. Actually, the only flaws we could find are the average audio and the photo quality in certain conditions when the images are sharpened excessively. Starting with the exquisite design that evolves around the stunning Infinity Display with lots of screen modes for optimum colour accuracy in various conditions, going through the most advanced connectivity capabilities on the market and finishing with one of the most powerful and power-efficient chipsets, you get a truly impressive package of hardware and software, complemented by a very good battery life. Whether you'd go for the S8 or the S8+ is simply a matter of which of the two is more comfortable for handling and of your personal taste regarding display size.

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