The Google Nexus 7 Review
by Anand Lal Shimpi & Brian Klug on July 26, 2012 11:35 AM ESTBattery Life
The Nexus 7 has an integrated 16Wh battery, which despite its size delivers extremely good battery life. Our WiFi browsing test saw the Nexus 7 deliver 9 hours of battery life on a single charge, that's roughly half an hour less than the new iPad.
The Kindle Fire comparison is even more impressive - the Nexus 7 outlasts the Fire in this test by nearly 70%.
Battery life while playing back locally stored video is just as impressive. Here the Nexus 7 clocked in at over 10.5 hours on a single charge, 82% longer than the Kindle Fire. Of course with only 8GB of local storage you're going to be forced to stream a lot of content to the Nexus 7, where it will get worse battery life.
Our 3D gaming battery life test shows how bad things can get on the Nexus 7 if you really stress the SoC and display: 4.08 hours. This is actually the only test where the Kindle Fire does better on battery. Do keep in mind that the Nexus 7 is technically doing more work (higher resolution and frame rate), which contributes to the delta in battery life here.
With 4 hours on the low end and 10.5 hours on the high end there's a pretty wide dynamic range for battery life on the Nexus 7. Keep that in mind because depending on your usage model you may end up closer to the lower end of that spectrum than you'd otherwise think. The big problem is without tons of local storage, you're going to end up relying on WiFi for content streaming needs a lot more than you would otherwise - which does have a tangible impact on battery life.
The Nexus 7 does take a good amount of time to charge its relatively small battery using the supplied 10W (5V, 2A) charger:
You can expect a full charge to take 3.35 hours, and about 3 hours to hit 90%.
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tuxRoller - Friday, July 27, 2012 - link
One more thing: the lag that happened when there was high io suggests that android isn't properly using the softirq for io that the preempt kernel provides.As for the cheap nand, I don't see why the oems couldn't use raw nand and then use a file system like nilfs or one of the others to let the kernel properly handle the io.
ssddaydream - Friday, July 27, 2012 - link
Interestingly, the Trinity kernel seems to improve IO throughput when used in conjunction with a certain script (TKT app runs the script when opened, I believe.)tipoo - Friday, July 27, 2012 - link
Yeah, I never got why it could be mostly smooth but going to a that blank search screen always lagged. Also similar to this if an app is writing to NAND it can take a while to get back to the home screen.TekDemon - Thursday, July 26, 2012 - link
To be fair the Kindle still has one other advantage as an e-Reader, you get to borrow a free book per month if you're a Prime member, in addition to the free video streaming support. So here it's really Amazon's ecosystem that's the Kindle's big feature-if you've bought into their ecosystem it'll give you quite a bit more content and they have a $39 per year student Prime (that you get after the expired Student trial) that does let you access videos/books.Of course if you're into the Amazon ecosystem I'd suspect that you're waiting on the Fire 2.
SantaAna12 - Thursday, July 26, 2012 - link
I think Gabe Newells comments regarding Apples controlling access is applicable to this device and Google. Google wants us on their cloud to sell us content.....its one of their business models. Amazon does the same.....but you can be smart and buy the CD. I think the more we talk about these issues the better......as knowledge is power. For me....this device doesn't work because of the lack of memory....and the known lack of sound quality.milli - Friday, July 27, 2012 - link
I feel you're ignoring the Playbook comparison a bit too much in this review. I've just bought a new Playbook 32GB for $175. Same 7" screen size (lower res though), OMAP4, bigger battery, better cam (front & back), ....Playbook OS is very usable since version 2.0. I use mine strictly professionally and at that, it's probably better than iOS en Android. Version 2.1 is around the corner and 3.0 around new years.
Maybe not the best option if you're an app addict but the amazing multitasking combined with what most call the best mobile browsing experience, made this a no brainer for me. The 'Print to Go' feature is very handy.
kenyee - Friday, July 27, 2012 - link
I have a Playbook too (earned it for porting an Android app).Playbook as muchhhhh better speakers.
Nexus 7 is what I grab for if I'm reading, etc. It's lighter than the Kindle and Nook so it's a lot more comfortable to hold for extended periods of time.
And no comparison to any 10" tablet...not sure what he reviewer is thinking...the 7" ones have a perfect use case for reading and playing games. The 10" ones might be better for web surfing for a little while until you get tired of holding it...
joshv - Friday, July 27, 2012 - link
One of my frustrations with the Fire (one of many) is the WiFi reconnect when you wake the device. It would frequently take 20-30 seconds, and that's a ton of time for a casual use device. On the other hand the iPad just seems to be always on the Internet. Pick it up, launch the browser, the Internet is on. I know that can't actually be the case, as it would decimate battery life, but the iPad somehow manages the WiFi connection almost perfectly.So, I am wondering how the Nexus 7 performs in this regard.
Impulses - Friday, July 27, 2012 - link
If it's anything like ASUS' other tablets (minus the Prime & it's signal strength issues) then it should be pretty seamless. I've rarely ever been held back while waiting for my original Transformer to connect, and I actually have it set to go into airplane mode when the screen is off, for maximum battery life... So it's doing a cold reconnect every time and it's usually good to go before I tap the browser icon.I'm pretty sure it reconnects faster than my Krait phone, tho the handover from 3G to Wifi is probably never given priority.
FWIW, the TF loses about half a percentage of battery life like that when sleeping. You can set it to always remain connected if you wanna receive live notifications or whatever but it'll obviously chew threw battery life much faster (probably twice as fast while idle, so you'd need to charge it every night or every other night at best).
kenyee - Friday, July 27, 2012 - link
It defaults to keeping wifi on even if the screen is off...and no problem w/ the batteries