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"The battery indicator on the iPad is a liar. Research from a display research company says Apple's new tablet continues to charge for a long time after the onscreen indicator shows it's full.\nRay Soneira of DisplayMate\u2014 whose research also showed that the new iPad's retina display drains significantly more power than previous models \u2014 conducted a test that showed the iPad kept drawing power at the full recharging rate of about 10 watts for two hours after it initially reported having a 100% charge. Only at 2:10 did the recharging \"fully terminate\" with a sudden drop in power.\nSoneira says he wasn't setting out to test the battery, and that he only looked at the iPad's power usage to see how much is going to the screen. However, when he noticed his equipment told him his iPad was charging even though the screen said \"100%,\" he decided to study the issue further. That's when he discovered the extended charge time. \nWhy would the iPad say it has a full charge when it doesn't? Apple isn't saying (a spokesperson didn't respond to a request for comment), but Soneira has a theory.\n\"The charge indicator on all mobile devices is based on a mathematical model of the charge rates, discharge rates, and recent discharge history of the battery,\" he told Mashable in an email. \"It's actually rather difficult to do because most batteries degrade slowly and then tend to surprise with a precipitous decline near the end. So there is something wrong with the battery charge mathematical model on the iPad.\"\n\nSEE ALSO: Is a Retina Screen on the iPad 3 Overkill?\nThe takeaway for users: If you want a full charge (for, say, your next flight), don't trust the display and be sure to keep your iPad charging for at least two hours after your iPad says it's had enough. Or better yet, simply leave it plugged in overnight when it's time for more juice.\nThis isn't the first time Apple has had problems with display indicators on iOS devices. Back in 2010, amidst the iPhone 4 \"antennagate\" flare-up, the company re-examined the signal-bar icons on the iPhone, and found them to be inaccurate. Soon after, Apple released a software update that addressed the problem.\nHow important is battery life to your tablet, and do you think this is a serious problem? Sound off in the comments.\nBONUS: A Tour of the New iPad\n\n\nApple's New iPad: 9 Features That Matter\n\n\n\n\n\n\n\n1. Retina Display\nThe most touted feature of the new iPad is its ultra-high-resolution \"retina\" display, which clocks in at 2,048 x 1,536 pixels -- a million more pixels than a 1080p HDTV. Thanks to the extra pixels and the iPad's new graphics processor, the screen has 44% better color saturation. The screen's pixels are so small, Apple says it had to change the design of the LCD itself to elevate the pixels above the circuitry to prevent distortion. Apple calls it the best display ever made for a mobile device, and -- from the specs -- it's hard to disagree. \n\n\n\n\n\n\n\n\n\n\n2. A5X Processor\nTo drive those millions of pixels in the retina display with the same fluidity of previous iPads, the new model features an upgraded processor, called the A5X. It's a dual-core processor, though it features quad-core graphics. Full specs aren't known yet, but benchmarks and teardowns revealed the previous A5 chip (found in the iPhone 4S and iPad 2) was a 1GHz processor. The new one is likely somewhere between 1 and 1.5 GHz.\n\n\n\n\n\n\n\n\n\n\n3. iSight Camera\nApple upgraded the iPad's camera to capture 5-megapixel still pictures and 1080p video (at 30 frames per second), though that's still less than the iPhone 4S's 8MP camera. However, megapixels aren't the most important thing about a camera. The backside-illuminated sensor, large f/2.4 aperture and automatic image stabilization will improve the quality of your photos and videos, especially in low light. However, the front-facing camera got no love, remaining at VGA resolution.\n\n\n\n\n\n\n\n\n\n\n4. LTE Models\nApple now offers different models of the iPad that can connect to the 4G LTE networks of both AT&amp;T and Verizon. Since the two carriers use different bands for LTE, the models aren't identical, so don't think you'll be able to switch at will. The pricing plans vary, too, but both carriers offer it month-to-month -- no contracts. Either LTE model offers connection to 3G networks when you take your iPad abroad, though -- a feature previously limited to the AT&amp;T version.\n\n\n\n\n\n\n\n\n\n\n5. Dictation\nThere's no Siri on board the new iPad, but Apple added a dictation option, accessible via a dedicated button on the virtual keyboard. You can use the new dictation feature to send a text message, search the web or write a note. Apple says it'll even work with third-party apps, letting you tweet or post to Facebook just by speaking.\n\n\n\n\n\n\n\n\n\n\n6. AirPlay Video Streaming at 1080p*\n\nApple upgraded the iPad's ability to use AirPlay streaming -- that is, transmitting video to the Apple TV wirelessly -- to 1080p. That makes complete sense, since the Apple TV just got an upgrade to 1080p. This doesn't appear to be complete mirroring, however, since Apple specifies that \"AirPlay Mirroring\" is only done at 720p (as opposed to \"AirPlay video streaming\"). Both the iPad and the iPad 2 will mirror to the new Apple TV at 1080p resolution over a hard-wire connection.\n*This item was corrected after reviewing Apple's spec sheet in more detail.\n\n\n\n\n\n\n\n\n\n\n\n7. Bluetooth 4.0\nUpgrading the iPad to Bluetooth 4.0 is helpful in a number of ways. Thanks to its ability to work with the newer low-power Bluetooth devices, it'll allow accessory manufacturers to build things like keyboards that you won't need to recharge for months or even years. Bluetooth 4.0 will also let the iPad interact with wearable devices like medical sensors, gathering data like heartbeat or blood sugar level and relaying it to medical personnel when needed.\n\n\n\n\n\n\n\n\n\n\n8. Much Bigger Battery\nAll these great new features -- especially the retina display -- demand more power, yet the new iPad has the exact same battery life as the previous model. That's because it has a brand-new battery, rated at 42.5 watt-hours, almost double the previous model's 25 watt-hours. It appears, though, Apple hasn't had a breakthrough in battery storage, since leaks prior to the event showed the battery is simply physically much larger.\n\n\n\n\n\n\n\n\n\n\n9. Thicker Design\nBecause of all the new radios, layers and gizmos in the latest iPad, it's actually bigger than before. The new iPad is 0.37 inches thick, or 0.03 inches thicker than the iPad 2, which was 0.34 inches. It's heavier, too: 1.44 pounds to 1.33 before. The bigger design apparently doesn't affect Smart Covers, and it's still smaller than the first iPad, which was 0.5 inches thick and 1.5 pounds. Still, the heftier new iPad is interesting proof that Apple will compromise on design for performance -- albeit only slightly.\n\n\n\n\n\n\n"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/03/23/ipad-battery-indicator-problem/>