10 hours.
How to Extend the Battery Life of an iPad. Just as with an iPhone or iPod Touch, the battery life of your iPad will be shorter during heavy use. However, there are some measures you can take to keep your device on and active for hours of enjoyment, and this article explains what you can do to lengthen the battery life. 1 Always charge your device before leaving home, especially on long trips. 2  Bring the charger with you if you are going away overnight, or for an extended period of time. 3  While the iPad battery is slated to last up to 10 hours, frequent use will shorten this time dramatically. RE: How long does the iPad battery last on a single charge? The iPad looks cool, but does the battery life stand up? Just curious if it is 2 hour usage time before in needs a charge or if it lasts longer than that!?  Steps. 1. Turn off Wi-Fi and cellular data (iPad + 3G) settings. Your iPad drains battery power when searching for and attempting to connect to the nearest Wi-Fi or cellular network tower, so if you're not planning on using Safari or apps that require these features, shut them off. 1 Always charge your device before leaving home, especially on long trips. 2  Bring the charger with you if you are going away overnight, or for an extended period of time. 3  While the iPad battery is slated to last up to 10 hours, frequent use will shorten this time dramatically. The new iPad claims 10 hours of battery life and does a good job of delivering, but the long charging time means that some users end up leaving the airport or hotel without a full charge. Change the iPad’s screen brightness to save battery life. Tap Settings then Brightness & Wallpaper to reduce the screen brightness and also Turn Auto-Brightness Off. Overall keeping a handle on the screen brightness is the best way to have a longer battery life on the iPad. Some iPad users complain that Apple’s new tablet’s battery doesn’t last as long as they’d like it to. Here are tips to drastically improve the iPad’s battery life. Many of these iPad battery saving tips will require some trade offs, but giving up some usability is a better option than carrying around a dead iPad. Change the iPad’s screen brightness to save battery life. Tap Settings then Brightness & Wallpaper to reduce the screen brightness and also Turn Auto-Brightness Off. Overall keeping a handle on the screen brightness is the best way to have a longer battery life on the iPad. 1 Repeatedly draining your battery completely (called a “deep discharge”) can shorten the life span of the battery. 2  So, if you use your iPad until the battery fails, you will get more use of your iPad on this particular charge, but you will reduce the number of times you can recharge your iPad’s battery. 1 Always charge your device before leaving home, especially on long trips. 2  Bring the charger with you if you are going away overnight, or for an extended period of time. 3  While the iPad battery is slated to last up to 10 hours, frequent use will shorten this time dramatically. To see how good the new iPhone's battery life really is, I ran it through our standard battery test and then compared the result to those of the iPhone 4S, and iPhone 4; for good measure, I also compared it to the third-generation iPad and iPad 2. It lasted 8 hours and 21 minutes—about 6 percent less than the iPhone 4S and about 4 percent less than the iPhone 4. Compared to the two current iPads (which have much bigger batteries), the iPhone 5 lasted 27.5 percent less time than the iPad 2 and 17 percent less than the third generation iPad. http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/. At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html, tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night.  Thanks to a power efficient Retina display and the new A7 chip, the iPad Air requires a lesser capacity battery to give the same amount of battery life. The iPad 4 had a 42.5 watt-hour, while the thinner iPad Air has a 32.4 watt-hour. Some tips to extend battery life: 1  Set Auto-Lock interval so that your iPad will turn off more quickly after a period of inactivity. 2  To set the auto-Lock interval, launch the Settings app, tap on General and then Auto-Lock and set the atuo-lock interval to either 1, 2, 3, 4 or 5 minutes.
http://www.wikihow.com/Extend-the-Battery-Life-of-an-iPad https://answers.yahoo.com/question/index?qid=20100416154047AAIDUVa http://www.wikihow.com/Extend-the-Battery-Life-of-an-iPad http://www.gottabemobile.com/2012/09/29/how-to-improve-ipad-battery-life-in-5-minutes/ http://www.gottabemobile.com/2012/09/29/how-to-improve-ipad-battery-life-in-5-minutes/ http://www.wikihow.com/Extend-the-Battery-Life-of-an-iPad http://www.macworld.com/article/2010535/lab-tests-how-long-does-the-iphone-5s-battery-last.html https://discussions.apple.com/thread/4049651?start=0&tstart=0 http://www.iphonehacks.com/2013/11/ipad-battery-tips.html
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