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"  My smartphone gets hot. Not so hot that it burns my hand, but close. Is something wrong? A little heat from an electronic device is normal. It&amp;#039;s an unavoidable side effect of charging, discharging, processing and illuminating. Stick your hand behind the ventilation grille of an HDTV or a cable box, or feel the bottom of your laptop. These things are like space heaters.   Just because gadget heat is normal doesn&amp;#039;t mean it&amp;#039;s good. To a user, excessive warmth emanating from a device may be irritating or even alarming; to the gadgetin particular, its batteryheat is a mortal threat. &amp;quot;Heat is a killer of all batteries,&amp;quot; says Isidor Buchmann, CEO of battery-testing firm Cadex Electronics.   He&amp;#039;s not exaggerating: According to his research, a lithium\u2011ion battery stored at 40 percent charge and 104 degrees Fahrenheita realistic temperature for common cellphone usewill lose 15 percent of its capacity over the course of a year. That number jumps to 35 percent if the battery is stored at full charge, as in the case of a laptop that&amp;#039;s left plugged in all day.   So, what, if anything, can be done about an overheating gadget? There are three common causes of a feverish phone: poor signal, intense workload and battery charging. There isn&amp;#039;t much you can do about a poor signal. Smartphone operating systems are fairly good at keeping renegade software in line, but it&amp;#039;s worth checking to see if there are any apps running in the background. The most likely culprit is actually a phone&amp;#039;s caseespecially if it includes a battery pack of its own. Let your phone go nude for a day, and see if that helps.   A scalding laptop can usually be explained by either an overactive processor or poor ventilation. Press CTRL+ALT+DELETE on a PC or open the Activity Monitor app on a Mac to check if any programs are straining the processor, then close or uninstall the worst offenders. Propping up a hot laptop to improve airflow will go a long way too: Some laptops, such as Apple&amp;#039;s, use their entire bodies as heat sinks.   Lastly, take a peek inside your computer&amp;#039;s exhaust or intake ducts. A dust buildup can result in severe overheating. If you&amp;#039;re willing, you can partially disassemble your computer and clean with compressed air or a fine brush.   If a gadget&amp;#039;s temperature gets out of hand, the device will usually attempt to save itself. A laptop will simply shut off without warning; smartphones will display a visual warning, then power down. If the problem persists, contact the manufacturerpersistent or extreme heat could be a sign of thermal runaway, which can result in a burst battery. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/gadgets/how-to/a3245/why-does-my-phone-get-so-hot/>