Apple claims the larger battery found in the new iPad will go a long way toward compensating for the tablet's dramatically increased pixel count. This weekend I got the chance to put the battery's compensation to the asus k43e battery test.
It took the better part of my day to get to that 10 percent point. Damn long-lasting tablets.
Over the last couple of days I've run CNET's tablet battery drain test on both the asus a53s battery new iPad and the iPad 2. The iPad 2's battery life hadn't been tested since iOS 4.3, so while my focus was on asus k53u battery evaluating the new iPad's battery, this was also an opportunity to see if iOS 5.1 brought any battery life improvements over 4.3.
The results
The results speak for themselves, but if you need further explanation, continue reading after the chart.
iPad (2012) iPad 2 (iOS 5.1) iPad 2 (iOS 4.3) Transformer Prime Transformer Prime w/keyboard dock
Movie battery life (in hours) 12.8 14.2 11.9 9.6 15.3
How we tested battery life
We evaluated battery life the same way we do for all tablets: by continually running a movie file on the iPad until its battery dies.
We set each tablet to Airplane mode and asus k53sj battery adjusted its respective brightnesses to 150 candelas per square meter (cd/m2) or as close to that number as possible. For each iPad, that's a AA-PB2VC6W bit lower than the halfway mark on the brightness scale.
We ran the 720p iPad version of "Toy Story 3." On the Transformer Prime, we ran a 720p version of "Toy Story 3." The new iPad also supports 1080p playback of movies, but we've yet to run the battery test with a movie file at that resolution.
On the iPads, we ran the movie through the asus k53sc battery Videos app; for the Prime, we used the movie player app mVideoPlayer, as it provides a much-needed repeat video function that not all native Android movie players include.
Analysis
While the new iPad drained faster than the asus k53s battery iPad 2, its 12.8 hours of battery life is still the second-highest result we've seen on a AA-PB2VC6W/B tablet using a single battery. Even compared with the Transformer Prime with its battery-embedded keyboard, the iPad lasted only 3 hours less. Even more impressive was that it achieved this running at that incredibly impressive 2,048x1,536-pixel resolution.
Looking at the iPad 2 results, we also asus k43 battery saw evidence that Apple made some very meaningful battery optimizations going from version 4.3 to 5.1 of its OS. And although the iPad 2 got 1.4 hours more juice when watching a movie, nearly 13 hours of continuous 720p playback is asus a53u battery nothing to thumb your nose at. That gets you an entire season of "Game of Thrones," with enough leftover power to squeeze in a couple "The Walking Dead" episodes as well. That's a lot of good-looking entertainment you can consume on just one charge.
We will follow up soon with more iPad battery life results, including Wi-Fi-, 4G, and 1080p tests. Also, check out our full tablet battery life list for more comparisons.
Eric Franklin
Eric Franklin is senior editor covering monitors and tablets and also manages CNET's San Francisco testing lab. When not reviewing the asus k53ta battery
latest products in his categories, he's usually gaming, system building (you know, desktop PCs), working out, or imagining himself as one of an interchangeable cadre of super-powered individuals performing really cool-looking actions in slow motion.
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