Apple's iPad - The AnandTech Review
by Anand Lal Shimpi, Brian Klug & Vivek Gowri on April 7, 2010 9:39 PM EST- Posted in
- Smartphones
- Mac
- Apple
- iPad
- Mobile
Honest Apple: Battery Life
I mentioned this in my iPhone 3GS review and I believe it bares repeating: Apple's battery life estimates have been ridiculously accurate over the past couple of years. I swear Apple must have my office bugged because my battery life numbers almost always equal theirs and they have no access to my test files.
To test battery life on the iPad I ran a modified version of the process I use for smartphones. I use the WiFi connection to browse a series of 20 web pages varying in size, spending 20 seconds on each page (I timed how long it takes me to read a page on Digg and came up with 36 seconds; I standardized on 20 seconds for the test to make things a little more stressful). The test continues to loop until the battery dies. This test is designed to simulate a relatively heavy, but realistic data load on the phone. We're stressing the WiFi radio, SoC, memory and display subsystems here. This should also be the sort of battery life you get when you are using any apps that use data (but not 3D acceleration). The display brightness was set to 50% on the iPad.
That's the test I use for smartphones, but to make it a little more stressful on the iPad I continuously played music using the iPod app, one of the only apps that's allowed to run in the background. I also told the mail app to automatically check my AnandTech email account every 15 minutes. I get a good amount of mail so this constant checking would add another realistic component to the workload. I also ran this same test on ASUS Eee PC 1001P:
The iPad came in just shy of Apple's 10 hour claim. At 9 hours and 45 minutes, it's long enough to get you through the greater part of a day. But calling Apple's battery estimates conservative is misleading. A single charge won't last you all day.
The iPad does last longer than ASUS' 1001P, however ASUS tells us that the 1005PE will buy you another 2 hours of battery life for an extra $79.
What about watching movies? Our resident smartphone expert Brian Klug put together a 6 hour loop of The Bourne Ultimatum. This was from a 1080p source but re-encoded using Handbrake's Normal profile resulting in a 1.3GB 720p rip that was looped three times.
I imported the movie into iTunes, synced it to the iPad and looped the already 6 hour loop until the iPad died. Display brightness was set to 50%, auto brightness control was disabled, automatic email downloading was also disabled.
Video playback is actually a fairly light use case. In these SoCs there's usually a dedicated video decode block, most likely the PowerVR VXD (same as in the iPhone 3GS). This block decodes each frame and sends it to the display output engine. The only things working in this case are parts of the CPU, the video decode engine, memory bus and the display engine. There's no 3D rendering and the vast majority of the CPU is idle. With this in mind, it's no surprise that the iPad can last 13.6 hours when playing back a 720p H.264 movie.
| Apple iPhone 3GS | Apple iPad | ASUS Eee PC 1001P | |
| H.264 Video Playback | 9.5 hours | 13.6 hours | 5.3 hours |
The iPhone 3GS however can almost hit 10 hours performing the same test. This gives you an idea of how much power the display is consuming on the iPad. The netbook doesn't stand a chance by comparison. The iPad was made for watching lots of movies on a single battery charge.
My final battery life test was a 3D gaming benchmark. I ran Real Racing HD on the iPad (and Real Racing on the iPhone) until the devices died. The cellular network was turned off on the iPhone 3GS and brightness was set to 50%.
Anything GPU intensive is going to be the worst case scenario for these SoCs. Here we’re stressing the CPU, GPU and memory subsystem. The added load is reflected in the battery life numbers:
| Apple iPhone 3GS | Apple iPad | |
| 3D Gaming | 3.9 hours | 8.8 hours |
The iPhone 3GS approaches 4 hours, while the iPad manages almost 9 hours while gaming. I’d also consider this to be a best case scenario gaming benchmark. A more intense 3D game could easily drop these numbers even further.
Facebook
Twitter
RSS
108 Comments
View All Comments
stcredzero - Thursday, April 8, 2010 - link
The review authors are displaying the case configured incorrectly, in picture after picture. The flap needs to be tucked in! This makes the case much more usable in the vertical, taller orientation as a stand. Also, who would set the case up as a stand and try to type in portrait orientation? That's like complaining your car can't do highway speeds in reverse! That's not what it's for!Tuck the flap in, then review the case. It's much better that way!
TemplarGR - Thursday, April 8, 2010 - link
I would like to thank Anand for this terrific and just review. Most reviews i have read so far are biased in favour of Apple, but this is just right.It is the only review so far that describes the total cost of ownership of this device. This device is a luxury item, an expensive toy. The starting price is a joke. 499 dollars for 16gb disk, no 3G, no camera, lack of apps? When you add the additional costs this device brings, it is way overpriced compared to a netbook or tablet pc. An EePc costs 300 while being more complete and far more powerful. And yes it draws more power, but i believe there are netbooks out there with 10+ battery life. I have to admit it also has a better display than most netbooks though.
I like some aspects of the iPad. I really like the touch interface for certain uses. I believe Apple has done a terrific job with its UI. The problem is that Apple charges a lot for just a touch UI compared to netbooks.
Since i am a Linux user and a programmer, i wouldn't buy it anyway. I am against Apple's closed ecosystem practice. But i like Apple's contributions to modern device and UI design.
The reason i am critical of Apple is that i do not like companies which make a practice to sell on hype and marketing instead of tech. Apple is almost like a cult. There are reviews out there(Ars for example) that say that luck of multitasking is a nice feature and makes their lives easier. This is almost pathetic.
I was afraid that Anand was under Apple's influence but i am happy i was wrong and he reviewed it for what it is, a luxury item not able to replace current devices. Thank you Anand!
piroroadkill - Thursday, April 8, 2010 - link
Is what I gleaned from that review. A nice looking screen isn't useful if the rest of the device is pretty much useless.There's maybe a single use case, and that's if you want to watch h264 encoded video miles from civilisation. Even then, I'd argue a netbook and a couple of spare batteries would always serve you better.
nquo - Thursday, April 8, 2010 - link
thoughts on iPad and its potential:http://nquo.posterous.com/ipad-bigger-than-a-big-i...
Jalek99 - Thursday, April 8, 2010 - link
Every local news report I saw today featured iPads. The anchors showing pictures on the device when they have the usual corner of the window or the huge monitors behind them.Then Jimmy Fallon showing some app on one...
The manufactured buzz is far more negative for me than anything the device itself merits.
Mike1111 - Thursday, April 8, 2010 - link
He was asking for 720p on the IPHONE! This can be done by using a 3rd party file manager that allows you to transfer videos to the iPhone without iTunes and then select them inside the app.Brian Klug - Thursday, April 8, 2010 - link
Ahh, you are indeed correct sir. I didn't do the encode for the iPhone, I'm assuming we just re-encoded again. ;)-Brian
SunLord - Thursday, April 8, 2010 - link
Did you know an apple store employee can pick a $499 ipad up for $350 which leads me to think per the norm for apple we be getting ripped off.piroroadkill - Thursday, April 8, 2010 - link
Well, no shit, it's an extremely low cost computer (with the possible exception of the screen) priced with a high price point.manicfreak - Thursday, April 8, 2010 - link
From some of the articles out there, the gross profit for the ipad can be anywhere from 50-60%. I'm not a fan of Apple's product, but I do admire their ability to get almost anyone from the media and the bloggers to hype up their underperformed, overpriced product.