Samsung Galaxy S8 and S8+ battery life test result is out

We already know that the Samsung Galaxy S8 and S8+ are two incredible phones: they have the stunning, futuristic design, they have the camera and they have the performance, but how do they do in terms of battery life?

After all, the Galaxy S8 and S8+ both have the tough task to deal with large, high-res displays and they have a very powerful system chip (for this test, we have the Exynos 8895 version of the phones, we will test the Snapdragon 835 model at a later point in time), both factors that could potentially consume a lot of power.

To find out about the Galaxy S8 and S8+ battery life, we put them through our standard test that allows us to compare all phones on equal grounds: with the screen set to the same level (200 nits of brightness, comfortable for typical indoor use). Luckily, the Galaxy S8+ does very well in this test and even though it is not the number one battery performer, it is certainly above the average for flagships these days. Note that we have tested using the Full HD+ resolution that our phones came set to by default (1080 x 2220 pixels).

Battery life (hours) Higher is better
Samsung Galaxy S8+ 8h (Excellent)
Samsung Galaxy S8 8h 22 min (Excellent)
Samsung Galaxy S7 edge 7h 18 min (Good)
Samsung Galaxy S7 6h 37 min (Average)
Apple iPhone 7 Plus 9h 5 min (Excellent)
Apple iPhone 7 7h 46 min (Good)
LG G6 6h 9 min (Average)
Google Pixel XL 7h 19 min (Good)
OnePlus 3T 5h 41 min (Average)
Huawei P10 7h 42 min (Good)

The Galaxy S8 and S8+ get similar, but not equal battery life test results. The Galaxy S8+ Exynos model that we tested scored exactly 8 hours, while the more compact S8 Exynos version topped this with a score of 8 hours and 23 minutes. Interestingly, the Snapdragon model of the Galaxy S8 scored less than the Exynos version: it went 10 minutes short of 8 hours.

Compare this with the 7 hours and 18 minutes that the already very good Galaxy S7 Edge scored, and you see that Samsung has managed to improve on their last year's phone. The S8 and S8+ also best the Google Pixel XL, the OnePlus 3T, but fall a bit short of the battery life on the iPhone 7 Plus.

In a nutshell, both the Galaxy S8 with its 3,000 mAh cell, as well as the S8+ with its 3,500 mAh battery run a long time.

On a separate note, we have recently noticed that more affordable phones, especially ones with the 14nm Snapdragon 625 system chip, do remarkably well in terms of battery life. In fact, we often get envy-worthy 2-day battery longevity on these phones, while the Galaxy S8 and S8+ are not quite in that territory. Still, when we speak about flagship grade devices, the Galaxy S8+ is definitely among the best out there. With a phone like this, you can be assured that you will get through a busy full day and still have juice left, even if you are a power user, and that is definitely reassuring.

Charging time (minutes) Lower is better
Samsung Galaxy S8+ 99
Samsung Galaxy S8 100
Samsung Galaxy S7 edge 99
Apple iPhone 7 Plus 197
Google Pixel XL 118
LG G6 97
LG V20 86
OnePlus 3T 85
Huawei Mate 9 144

Another important aspect of battery usage is the time it takes to fully recharge a battery from 0 to 100%. The Galaxy S8 and S8+ support Samsung's Fast Adaptive Charging and both phones are able to fully recharge their battery in just 1 hour and 40 minutes. This is not the fastest we have seen, but it is not too far off. The Galaxy S8+ also supports fast wireless charging, which is a neat feature to have.

Related phones

Galaxy S8+
  • Display 6.2" 1440 x 2960 pixels
  • Camera 12 MP / 8 MP front
  • Processor Qualcomm Snapdragon 835, Octa-core, 2450 MHz
  • Storage 64 GB + microSDXC
  • Battery 3500 mAh(24h 3G talk time)



1. tango_charlie

Posts: 347; Member since: Nov 16, 2011

So you are telling me that the S8+ with its bigger display and smaller battery lasts longer than the S7edge? I'll wait for real life tests....

2. Victor.H

Posts: 1079; Member since: May 27, 2011

...and with its 10nm system chip that is much more power efficient.

10. Carlitos

Posts: 673; Member since: Oct 23, 2011

And 8 core processors on both models. Why Exynos variants always managed battery life considerably better than Qualcomm s7. Exynos consistently got almost 2 extra hours of screen on time

43. marorun

Posts: 5029; Member since: Mar 30, 2015

SD820 Carlitos is not 8 core...

111. TechieXP1969

Posts: 14967; Member since: Sep 25, 2013

Because the GPU in the Exynos is more efficient vs the Adreno in the SnapDragon. Qualcomm like Nvidia's Tegra, pushed for the chips to have almost desktop-like performance while the Mali is design not to be a heavy pusher of graphics, but just slightly above moderate.

114. ebilcake

Posts: 1231; Member since: Jul 16, 2016

Translated - Samsung throttle performance a hell of a lot more then the competition.

122. TechieXP1969

Posts: 14967; Member since: Sep 25, 2013

It is not an 8 core CPU. It is a dual quad core. Only 4 cores are every running at any one time. Thus making it quadcore. The phones have a lower colocked quadcore and a higher clocked quadcore. Both quads are BIG.little in where the littles cores are also a lesser chipset type. Think of it as an i5 for four of the cores and an i7 for 4 of the cores.

17. AllFanboysMatter

Posts: 206; Member since: Feb 14, 2016

Where is the S8 battery test?

30. sissy246

Posts: 7124; Member since: Mar 04, 2015

Did you even read the article

75. Rydsmith unregistered

Did you actually read his question? S8 not S8+

96. AmashAziz

Posts: 2934; Member since: Jun 30, 2014

Did you even read his comment? He asked about the S8......genius.

40. tango_charlie

Posts: 347; Member since: Nov 16, 2011

In real life situations that 10nm chip won't make a huge difference, since most every day tasks like messaging, facebook, surfing... don't consume that much processor processor power. Power intensive tasks like gaming or video editing is surely a different story. Someone who owned a S7 edge and does the same tasks on the S8+ will definitely have much worse battery life (only exception: if he does a lot of heavy tasks like the ones mentioned before). So my previous statement is still legit: Bigger display + smaller battery capacity (even with a 10nm soc) = worse battery life than S7 edge

56. Settings

Posts: 2943; Member since: Jul 02, 2014

To further add insult, S6 EDGE+ lasts longer than S8+. S6 > S7 > S8 Samsung is not improving battery life of its phones.

61. trojan_horse

Posts: 5868; Member since: May 06, 2016

S6 > S7? No, just No.

81. ShadowSnypa786

Posts: 595; Member since: Jan 06, 2017

Im pretty sure you wrong S6 has a battery life endurance rating of 73h S6 edge has 73 hours too S6 edge + has a endurance of 83 hours S7 edge has a battery endurance of 92 hours So yeah they improved from S6 to S7 definetly. Cant really comment on S8 till GSMArena have a review out.

147. sgtdisturbed47

Posts: 969; Member since: Feb 02, 2012

And they still can't beat the iPhone 6S Plus. If they were going to be serious about this device, they would have given is a 2-day battery. S8+ won't make it very far into the next day. S7 Edge sure as F didn't for me.

151. DerryAhmad

Posts: 296; Member since: May 05, 2012

Naah.. this is simply not true. I have both S6 Edge and S7 Edge. The S7Edge battery life is far better than the S6 Edge.

90. xondk

Posts: 1904; Member since: Mar 25, 2014

That is not how it works out while yes, screen uses most power, screen tech is steadily improving as well, using less and less power, add the less power with 10nm and it isn't really a wonder it lasts for that long, and you forget this is the 8+ not 8, meaning it has the bigger battery. 3500mah in S8+ vs 3600 mah S7 edge. So yeah, is doesn't really seem that far fetched?

92. remixfa

Posts: 14605; Member since: Dec 19, 2008

if it was an apples to apples comparison then your comment would have merrit. however, your comment lacks all merit because it is not an apples to apples comparison. They are completely different devices. The 835 and newer Exynos chips consume about 30% less battery to do regular tasks than the previous chips found in the S7. The difference is even greater when the GPU is activated. Many of the other components are newer and thus more efficient as well. Add in the fact that the battery tech itself is formulated different to last longer over time with the same MAH rating. All of this points to a phone that will last longer doing the same thing as the previous versions of phones with similar battery rating. your point is completely pointless and wrong.

149. Vador225

Posts: 23; Member since: Jun 19, 2016

Hum, the 10nm chip S835 and the Exynos are 40% less power efficient than the previous generation. So I don't think your statement is true. In the same test, the S7 edge with bigger Battery than the S8 (100mAh more) and smaller Screen (5'5 vs 6'2) don’t have more Battery life.

52. Hyperreal

Posts: 361; Member since: Oct 08, 2013

But with display set to full HD resolution while gs7 edge test was done with QHD for sure. I guess with higher resolution results would not be that good.

58. tedkord

Posts: 17417; Member since: Jun 17, 2009

Possibly. In real life, I notice very little difference in battery life between FHD and QHD on my S7 Edge.

82. ShadowSnypa786

Posts: 595; Member since: Jan 06, 2017

Thats because the feature that lets you lower resolution doesn't do anything for the battery life. It eases up your GPU but dropping the resolution down to 720p or to 1080p will make no difference to battery its been proven This is what GSMarena said "We also tested if selecting a lower display resolution (a new feature introduced by Android 7 Nougat) would have a positive impact on the battery life. We compared the battery performance using the native 1440p setting as well as the lowest available setting of 720p. The short answer is - the change in resolution didn’t affect any aspect of the battery life - not in our testing routine. The minor differences we recorded were in the minutes, and are well within the margin of error of the tests. Perhaps an alternative usage pattern might lead to some meaningful advantages of going low-res, but our experience doesn't point in that direction. One such potential scenario is gaming, but then again you already had the option to limit resolution within Game launcher"

157. whattab

Posts: 16; Member since: Mar 04, 2015

Thank you. I never hear anyone talk about this. I know I can't have been the only person with a Note 7 testing this feature out. When I was upgrading from the S7 to the Note 7, I was excited about being able to "drastically" extend the battery life by lowering the screen resolution. As I slid the button from the highest down to lowest (720?), it said right on the screen that it would only extend the battery life by some irrelevantly small number - somewhere near 30 minutes, if I recall correctly.

76. WPX00

Posts: 511; Member since: Aug 15, 2015

Also important to note that PA's battery test is particularly demanding on the S820 family. Did you guys ever test the Exynos S7?

145. Ruturaj

Posts: 1484; Member since: Oct 16, 2014

I guess, Samsung also improved display technology for efficiency with that. Since only node shrink won't improve this much battery life on its own.

161. stijnvbml

Posts: 76; Member since: Feb 20, 2013

If I compare the phones I had and how they score in Phonearenas battery test, it seems reliable. I actually trust your battery test the most currently!

162. yann

Posts: 614; Member since: Jul 15, 2010

Victor, don't embarrassing yourself more. Your iPhone battery life test is ridiculous. All my friends with iPhone barely last a day. So, in that kind of thoughts - i don't believe your tests. They are faked.

166. Cryosx

Posts: 3; Member since: Sep 27, 2011

...and with it's 6.2 inch screen it uses more energy

3. torr310

Posts: 1679; Member since: Oct 27, 2011

LOL, I highly doubt it too!

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