Despite the fact that the Galaxy S9 and S9 Plus have the same battery capacities as last year
– that's 3,000mAh and 3,500mAh respectively – I expected them to exceed the 2017 battery life. Or at least undeniably meet the same standard.
The main reason for this expectation is the Qualcommwhich is used in the Galaxy S9 and S9 Plus phones in the US and other countries. Samsung equips the Galaxy phones in some regions with its in-house Exynos chip, but it's the Snapdragon 845 we've tested the most.
Qualcomm promised that its Snapdragon 845 chipsetthan the 2017 Snapdragon 835 chipset that powered the Galaxy S8 and S8 Plus. The mentioned battery savings mean that the Galaxy S9 and the larger S9 Plus would run longer with a single charge than the two S8 phones that use the Snapdragon 835 chip.
Instead, the battery of the Galaxy S9 sparked earlier than the Galaxy S8 phone in our Looping Video Battery Endurance Test. The Galaxy S9 Plus fared better and outlasted the Galaxy S8 Plus in our battery tests, but only by 4 percent. And even this gain is much smaller than the optimal battery saving suggested by the Snapdragon 845 chip. (See details below.)
Granted, ouris a very specific counter; It does not capture the full picture of phone usage, such as loading websites and downloading images, streaming videos, and navigating Google Maps. And it does not resist Phonemakers, who "optimize" their software for just that type of rating. But our test provides a basis useful for comparisons that go beyond random observation.
On the other hand, pure observation showed that both Galaxy S9 and S9 Plus were much slower slower than the Galaxy S8 and Galaxy S8 Plus if I did not actively use them (that's good). Again, I break all this down, so stay with me.
I've been watching battery usage since I use the Galaxy S9 Plus almost exclusively this March. And while the phone lasts me with a single charge from morning to night, I'm disappointed that either the Galaxy S9 Plus does not use the promised battery power of the Snapdragon 845, or perhaps the chip is only theoretically more efficient.
The party to blame is difficult to analyze as software and hardware work together to manage the phone's battery resources.
Now read on to get lab test results, idle-run comparisons and what you can do to manage the battery life of a Galaxy S9 phone.
Laboratory Test Results for Galaxy S9 and S9 Plus
We tested three different Galaxy S9 units (one with the Exynos processor) and four Galaxy S9 Plus phones through our video drainage test. Some of these phones were borrowed from Samsung, some of which we bought. The results were everywhere on the map, which made us incredibly frustrated, so we ran the tests over and over again.
The following numbers give the average of the test results for the Galaxy Battery Discharge – minus the Exynos unit – compared to the average results for multiple Galaxy S8 and S8 Plus devices. Note that the Galaxy S8 and S9 phones have the same screen size: 5.8 inches for the smaller devices and 6.2 inches for the Plus versions. Comparable screen size means that no phone automatically consumes more power to illuminate a larger screen than the previous generation.
The graph also shows how many hours of battery life we would expect compared to the Galaxy S8 values, assuming the Snapdragon 845 processor has increased its efficiency by 30 percent (which is a theoretical number; World results are often lower).
Galaxy S9 Battery Test Results (Snapdragon 845 Chipset)
|Battery Capacity||CNET Video Drain Test Average *||Best Case Battery Life from 2017 Galaxy S8 / Plus (+ 30%)  Tested percentage change from 2017 Galaxy S8 / Plus|
|Galaxy S9||3.000mAh||15 hours, 30 minutes (15.5 hours)||20 hours, 9 minutes (20:15 hours)||-3.1%|
|Galaxy S8||3.000mAh||16 hours||N / A||N / A|
|Galaxy S9 Plus||3.500mAh||18 hours||23 hours, 24 minutes (23.4 hours)||4%|
|Galaxy S8 Plus||3.500mAh||17 hours, 18 minutes (17.3 hours)||N / A||N / A|
* Looping video in airplane mode, screen brightness and headphone volume set to 50 percent (standard resolution)
Finally, you can see the battery gains and losses from our tests compared to the previous year's Galaxy S8 results. The Galaxy S9 died earlier than the Galaxy S8 of the previous year (a change of -3.1 percent) and the Galaxy S9 Plus brought about 4 percent better battery life compared to the Galaxy S8 Plus; an improvement, but not the KO we had hoped for. Samsung Galaxy S9 Plus Unboxing 21
We also ran battery tests for a Galaxy S9 with Samsung's Exynos 9810 chipset for an average of 15 hours, 20 minutes on a single charge.
What this result means : The Galaxy S9 and S9 Plus should give you the same battery life as the previous year's Galaxy S8 and S8 Plus, if you actively use them.
Galaxy S9 battery has better no-load drain than the Galaxy S8
If the battery is not actively charging, it will discharge. All phones lose battery capacity even if you do not "use" them. This is called idle drain – the phones are still running apps and processes, checking messages, pinging data, and so on.
To test whether the Galaxy S9 is faster or slower empty than the Galaxy S8, I've fully charged both phones, the brightness increased to 50 percent, the flight mode turned on and at the same time unplugged the plug from the plug. Then I kept an eye on their percentages over the next week.
The Galaxy S9 ran much slower over time than the Galaxy S8. After 72 hours, the Galaxy S9 had lost 50 percent of its battery life, while the Galaxy S8 had lost 59 percent.
Seven days into the test, the Galaxy S8 battery reserves had their last breath, while this year's S9 still has 25 percent to drive.
What this result means : The only variable I could not explain is how fresh the battery of the S8 is. Batteries lose their capacity as they age, and the Galaxy S8 had more hours over its life than the Galaxy S9 when I started this test, even though this device was under-utilized in the last year.
While the idle-drain test is not scientifically bulletproof, the large percentage gap suggests that the Galaxy S9 has a longer standby time than the Galaxy S8.
Battery consumption in the real world
The Galaxy S9 Plus loaner, which I used almost every day, keeps me reliable from 6am to 10:30 pm even though there are nights when the battery reserves are down 10 percent lie until I go to bed. On other days of easier use, I could leave the hay at 20 or 30 percent.
When I'm home, I'm glad the battery is nearing the edge. A fee is just a few meters away. But when I'm outside, a steady slide into each digits is too risky. I feel compelled to replenish the S9 Plus when I know I'm going out.
As with any phone, map navigation, uploads, downloads, and video and audio streams can quickly absorb battery reserves. But even after my morning check-in on social media and reading the news, I would note that the battery often dropped to 80 percent within 2 hours, and often dropped to 70 percent within 3 hours of waking up.
The Galaxy S9 Plus has never died before 10:30 am, but it's close.
What Does This Result Mean : Do not count on the Galaxy S9 to get you from morning to early morning. As with most phones, if you are looking late at night, you should bring a charger or a battery with you, or after a few hours, prepare yourself to turn the power saving mode on.
How to Keep the Galaxy S9 Battery Longer (Without Installing Other Apps)
No phone is immune to battery discharge, and the more you use it (especially streaming media and map navigation), the faster these energy reserves run dry , The Galaxy S9 and S9 Plus have built-in battery settings to keep the phone alive longer.
- Disable Wi-Fi and Bluetooth if you do not use them.
- Enable Wi-Fi Sleep Mode to reduce battery drain when you are not active on Wi-Fi.
- Turn on two power saving modes. This reduces the brightness, limits the CPU speed (the phone works a little slower), disables the always-on display and can reduce the screen resolution.
- Select apps that do not draw energy when they're not active.
- Select apps that never run in the background.
Hope for longer battery life is emerging
Samsung knows that battery life is a hot spot for shoppers and already promises a long life for its upcoming Galaxy Note 9 . The Phonemaker in a video before the unpacked event on 9 August. Samsung's opinion is certain an extension of battery life, and we can hope that the company can make profits with 2018's Note 9 and 2019 .
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