"There's a lot of intelligence built into the charging process, with algorithms that help the adapter determine what the phone can take," says Geoff Gordon, a marketing manager at the company. (On some Motorola smartphones, Quick Charge is branded Turbo Charge.) Qualcomm, which is known for its Snapdragon smartphone processors, is also behind the rapid-charging Quick Charge tech found in more than 100 smartphone models, including flagship phones from Samsung, Motorola, HTC, and others. 2A for standard phone chargers).īut although the new phone chargers are built for speed, they default to a slower charging setting that's safe for all smartphones (5 volts at 500mA to 2A) when they sense they've been plugged into an unsupported device. Others, such as the DASH system used by the OnePlus 3 smartphone in our ratings, keep the voltage at 5V but raise the amperage (4A vs. Some work by feeding the phone at a higher voltage (9 volts instead of the 5 volts put out by standard USB chargers). There are several types of rapid phone chargers. There's no reason to fear a fire, explosion, or even premature death of your smartphone if you mix and match charging devices. In brief, the answer is yes, according to the engineers and safety researchers we asked. But the fires caused by all those Samsung Galaxy Note7 phones could make them fearful of taking risks with mobile-phone batteries. Which raises a question: Is it safe to plug one of the new, fast-charge phones into an old, slow charger? And, conversely, can you use a new charger with an old phone?Īs an example, can you use the rapid charger from a new Google Pixel phone you buy this fall with an old LG G3 smartphone? After all, many people would like the convenience of using whatever charger's at hand. In 2014, fewer than a half-dozen phones in Consumer Reports' smartphone ratings came with that technology today 20 do, and it's fair to assume that, with the exception of iPhones (at least so far), it will be a standard feature on all but the least expensive phones. In the past two years, smartphones have been coming with fast-charging technologies that let you bring an almost dead battery up to 50 percent in as little as 15 minutes. Today's smartphones have various energy requirements, too. And the reason for that was simple: A mismatch between the power needs of the Sony Walkman it was feeding and what the adapter actually delivered could have stopped Rod Stewart in his tracks-perhaps for good. Your dad's old RadioShack universal adapter probably had a slide switch on it for adjusting voltage.
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