The Google Nexus 9 scores excellently on our battery life test


One of the key findings you'll stumble upon if you go through our Google Nexus 9 review concerns the slate's battery life. Simply put, it's awesome – as the slate held its ground for the whopping 9 hours and 24 minutes. That's excellent considering the trying nature of the script we run.

Putting those numbers into words, you should expect up to two days of usage with the Nexus 9, so long as you don't go down on it crazy hard, of course. We know because of the aforementioned script we use to test battery life – it replicates the average user's habits and arrives at a final figure that is indicative of the hands-on time you can squeeze out of it on average. 

The Nexus 9's score puts it in front of competitors like the Apple iPad Air 2 (7 hours 27 minutes), the Samsung Galaxy Tab S 10.5 (7 hours 2 minutes), and even the enormous Samsung Galaxy NotePRO 12.2 (8 hours 58 minutes). With a charging time of 254 minutes, the Nexus 9 is also one of the fastest tablet devices to recharge from zero to full on our list – behind only the Apple iPad mini 2 and the Samsung Galaxy Tab S 8.4.

Take a look at the charts below.



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Nexus 9
  • Display 8.9" 1536 x 2048 pixels
  • Camera 8 MP / 1.6 MP front
  • Processor NVIDIA Tegra K1, Dual-core, 2300 MHz
  • Storage 32 GB
  • Battery 6700 mAh

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31 Comments

1. darkskoliro

Posts: 1092; Member since: May 07, 2012

Still waiting for the K1 hate on battery life

5. Finalflash

Posts: 4063; Member since: Jul 23, 2013

K1 might be fine and all, but I can guarantee that most of the battery longevity comes from Project Volta. I have the same effect on my Nexus 5 with the preview right now, it literally lasts days with light use now whereas before it would be almost dead by the end of the day.

29. vincelongman

Posts: 5724; Member since: Feb 10, 2013

I dont think we are seeing the benefits of Project Volta yet Installing Lollipop doesn't simply give you the benefits of Project Volta Apps devs actually need to update their apps to use the new Project Volta battery saving APIs, otherwise their apps will still be the same as on KitKat I think the battery improvements from Lollipop are currently from the improved kernel and other under the hood improvements like ART My Nexus 5 is getting ~4-5 hours SOT which is same as I was getting on KitKat with a custom kernel, unbounce and undervolt, without the modifications I was getting ~3-4 hours SOT Hopefully when devs update their apps we'll get ~6 hours SOT

13. irellemot

Posts: 109; Member since: Nov 29, 2012

Yeah, i love how people said they wouldn't buy it because the small battery and how it ruined the whole tablet. I bet they are regretting that right about now.

23. TyrionLannister unregistered

This is not the hated k1. This is the ARMv8 based custom denver core equipped dual core tegra k1. Just equip the nexus 9 with the cortex a15 based tegra k and see the battery test come down to

2. rd_nest

Posts: 1656; Member since: Jun 06, 2010

[Copied from another article] Here's my question to PhoneArena: 1] At what display brightness is the test done? Full, half? or any specific NITS? 2] Is background data on or off, device in flight mode? 3] Is GPS on/off? 4] Does take into account 3G/LTE usage or WiFi? or is data completely off? 5] Is audio ON? 6] Does it take into account the standby usage of device? All these parameters will play a major role in battery usage.

9. Finalflash

Posts: 4063; Member since: Jul 23, 2013

Doesn't matter, the same options were enabled and set on all the other tablets they tested. The brightness is the only thing that could be different between them unless they normalize them to similar nits like Anandtech does in their testing. Yet if they went with the same standard percentage in their testing, the Nexus 9 would be brighter than all the other tablets and still out perform them. Also, most of the battery longevity guaranteed comes from Project Volta. I have seen the same affect on my Nexus 5 and likely, everyone who gets Volta will experience the same boost. Good times in the Android camp these days, kind of feel bad for the rest.

26. rd_nest

Posts: 1656; Member since: Jun 06, 2010

What doesn't matter?? Are you on drugs or what? You think it doesn't matter whether you have a script running webpages or whether you are running a movie?Do you think it doesn't matter whether you can decode the codecs natively or through software? Do you think it doesn't matter if GPS is ON/Off? Do you background data/sync has no effect on batterylife? People like you shouldn't be allowed to comment.

27. rd_nest

Posts: 1656; Member since: Jun 06, 2010

Lollipop isn't going to magically improve batterylife. Before I conclude this section, I just wanted to note that Android L alone won’t improve battery life on these tests. Android RunTime (ART) won’t help with battery life as these applications are native code. Job Scheduler is also irrelevant to our tests, as it will only improve battery life in situations where multiple applications are running in the background. We make every effort to ensure that no background tasks occur during these battery life tests and auto-sync is disabled as well in order to make sure that the only task running is the one under test. We have already run the data early in the summer on the Nexus 5 with Android L developer preview and our data does not show any significant difference in battery life. However, in real world usage where background applications and data syncing are active, one can expect greater battery life with Android L but only in the range of 10-15%

28. vincelongman

Posts: 5724; Member since: Feb 10, 2013

Also installing Lollipop doesn't simply give you the benefits of Project Volta Devs actually need to update their apps to use the new Project Volta battery saving APIs, otherwise their apps will still be the same as on KitKat

3. MrsJedi

Posts: 25; Member since: Oct 17, 2014

Go Nexus!!!!! Oh and Sony did a good job as well. :) Shame on you Apple though your devices should be the best at every thing since they are the most expensive ones.Battery life is still good though.

4. DeusExCellula

Posts: 1390; Member since: Oct 05, 2014

Nice performance. Looks like Sony is producing some really energy efficient devices. Most of them have great battery life and the batteries are smaller capacity. Still the Nexus 9 lookin pretty solid out there.

14. Commentator

Posts: 3723; Member since: Aug 16, 2011

Not to be a Debbie-Downer, but the Z2 Tablet is also the only one on the list with "just" a 1080p screen.

18. Commentator

Posts: 3723; Member since: Aug 16, 2011

*Sorry, 1200x1920. May as well get the facts right, unlike a CERTAIN particular website, which for the dignity of those involved will go nameless (but which also erroneously reports the Nexus 9 has an "all-plastic body" in their review...)

6. Tolooei

Posts: 32; Member since: Oct 24, 2014

nexus 9 is better in tablets ...

7. Tolooei

Posts: 32; Member since: Oct 24, 2014

design htc is good

8. Tolooei

Posts: 32; Member since: Oct 24, 2014

Nexus and HTC are the best

10. newbey123

Posts: 702; Member since: Mar 19, 2012

HTC and Google killed it with this tablet. Best tablet available. Good job! Picking mine up this week.

15. Commentator

Posts: 3723; Member since: Aug 16, 2011

Picking mine up today! (Probably.)

11. Sakeem

Posts: 862; Member since: Sep 05, 2012

So tempting. I'm enjoying my Tab 8.4 though.

12. remixfa

Posts: 14605; Member since: Dec 19, 2008

Id call that a win for team Nexus. :)

16. Zylam

Posts: 1817; Member since: Oct 20, 2010

Hey Chris P, how does Phone area do its battery tests? Can you let us know what's in this typical usage script you use? Thanks!

17. PopeFrancis

Posts: 110; Member since: Aug 05, 2014

How does the Nexus 9 compare with the nvidia shield tablet in battery life? I've seen some other sites that say the shield has good (not outstanding) battery life. I would love PA to add the shield tablet to their battery benchmark, that way they would be compared in the same grounds.

19. aBoss

Posts: 164; Member since: Sep 15, 2014

So 2 hour difference yet both still excellent? thats a joke (ipad, nexus)

20. fzacek

Posts: 2486; Member since: Jan 26, 2014

This definitely gives the Nexus 9 an edge over the iPad Air 2...

21. blingblingthing

Posts: 977; Member since: Oct 23, 2012

Go Nexus

22. androidwindows

Posts: 216; Member since: Oct 04, 2014

Hahaha....Phonearena pulled down John V's Nexus 9 review. Didn't he know that reviewers aren't allowed to publish the new Nexus review before November 12?

24. Commentator

Posts: 3723; Member since: Aug 16, 2011

Apparently not. Also: why?

25. androidwindows

Posts: 216; Member since: Oct 04, 2014

I have no idea. I just remember hearing a tech reviewer (forgot which site) mention that in a hands-on video of nexus 6.

30. gaara6775

Posts: 738; Member since: May 20, 2014

People who hate on k1 will buy iPad air2 and end up draining their battery faster.

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