Starbucks plans to have wireless charging stations in all its company-owned stores in major United States markets by the end of 2015.

IT may not seem hard to plug a cord into the wall to charge your mobile phone or tablet. Nonetheless, a number of companies are trying to figure out how to save us from the effort.

While still in a nascent stage, wireless charging is becoming a reality, with recent announcements by Starbucks and Cadillac that they’ll both be offering the technology. Set your smartphone down on a small mat at a table or in your car’s dashboard, and your device will charge.

“It’s a paradigm shift,” said Daniel Schreiber, president of Powermat, one of the industry’s major players in this technology. “Once you have wireless charging in cars, your bedroom and a coffee shop, you don’t have to think about power.”

There are two main competing versions of wireless charging trying to gain market share. Both use a similar technology that allows users to place smartphones or tablets on a charging mat and power up in no more time than using a cable would take. For the wireless connection to work, a receiver — which could be in the device but at this point is more likely to be in a special case that you have to buy — picks up an electrical charge from a transmitter coil in the charging mat.

Samsung offers replacement wireless charging backs for various phones, including its Galaxy S5.

The Wireless Power Consortium, a trade group, is promoting one technology, Qi (pronounced chee). The consortium’s members include LG, Philips, Samsung, Sony and others, with more than 500 Qi-compatible products now available.

Its competitor, the Power Matters Alliance, has joined up with a third group, the Alliance for Wireless Power, or A4WP, which uses a slightly different technology, to create one interoperable version that will also allow the transmitter and receiver to be placed at greater distances from each other.

Powermat, the alliance’s most prominent member, is supplying the technology that Starbucks will use when it embeds charging stations in all its company-owned stores in major United States markets by the end of 2015. Each shop will have about 12 charging stations.

So which technology is better? According to Mr. Schreiber of Powermat, neither.

“At a technology level, the differences are not that pronounced,” he said. “And lots of devices integrate both standards.”

Unfortunately, charging a device wirelessly does not mean you can simply plop any smartphone down on a power mat; a compatible receiver is essential. Although those receivers may one day be built into phones, for now, they usually require some sort of case.

Samsung, among other manufacturers, offers replacement wireless charging backs for its Galaxy S4, S5 and Note 3 phones. Google’s Nexus 7 tablet includes built-in wireless charging. If you use an iPhone and some other Android models of phones and tablets, you’ll need to ditch your current case and wrap them in what could be a bulkier receiver that is compatible with either the Qi technology or the one endorsed by the power alliance. .

“Cases are a steppingstone to raise awareness of wireless charging,” said Ryan Sanderson, an associate director at IHS, a research firm. “Mass adoption will happen when charging is integrated into the device.”

In addition to Starbucks, wireless charging stations can be found in some hotel rooms, airport clubs and restaurants.

Automobile manufacturers are beginning to embrace wireless charging; not only does it help drivers keep their devices charged, but its ease of use theoretically encourages car owners to put away their distracting cellphones when in motion.

Audi will introduce wireless charging worldwide “soon,” said Anupam Malhotra, Audi of America’s senior manager of connected vehicles. By creating a “phone box” with wireless charging, the ability to gain access to smartphone apps on the vehicle’s display and a connection to an external antenna to improve reception, “we can incentivize the customer to put the device away,” he said.

With Cadillac, it’s more of a mandate than an incentive. Wireless charging will appear in its ATS, CTS, Escalade, Silverado and Sierra models by the end of the year; drivers will power up by placing their smartphones behind the vehicles’ CUE information display screen, which will then remain locked until the car is put back into park.

To ensure that a customer doesn’t have to choose, Cadillac will offer both wireless charging technologies in its vehicles. Audi is in discussions with Powermat. And Toyota offers only Qi-compatible wireless charging on its Avalon and 2015 Camry models, as well as the coming Lexus NX and Scion xB.

The Qi technology will introduce a new variation that uses resonance technology, to allow charging to take place even when a device is 45 millimeters away from the charging point. That will allow the transmitter to be embedded inside a desk, for example.

If you’re on the fence, which wireless charging standard should you buy? Perhaps neither, Mr. Sanderson said.

“You might want to wait six months and hope that there will be a receiver that supports all three standards,” he said. “There have already been demonstrations of chips that do that.”

Wireless charging will appear in a handful of Cadillac models, including the ATS, by the end of the year.

 
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