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As we approach the expected September iPhone event, the gadget world is abuzz with questions: Will there be two new iPhones or three? How much will the presumed high-end OLED model cost? Will facial recognition fully replace Touch ID, or merely be an alternative? And: will the iPhone finally get wireless charging?

But that last one is a loaded question because "wireless" charging is in the eye of the beholder.

Sure, you can place a Samsung Galaxy and many other Android iphone replacement screen onto a charging pad without having to plug the phone into any charging cable. And those same pads are increasingly built into countertops at coffee shops, burger joints and even furniture you can buy at Ikea. But those pads still need to be plugged into a wall outlet. The wire is still there, it's just not attached directly to the phone.

That's a roundabout way of saying "wireless charging" is basically a misnomer. Except when it isn't: "True" wireless charging -- in which batteries get juiced up at distances measured in meters, not centimeters -- is a real-world technology, too.

Wireless charging over a distance could be the real tech game changer, allowing us to juice up our phones as soon as we walk into a room. The technology is also a boon to the ever-increasing number of smart devices in our lives, from portable speakers to hearing aids. It just needs to get over the pesky questions over whether it's safe -- and actually show up in a mass-market consumer device.

So, before we posit the question as to whether the next iPhones will include wireless charging, let's start by untangling the different technologies that Apple might incorporate.

Inductive charging: Qi vs. Powermat

Widely used for years in cordless electric toothbrushes, inductive charging is the most common technology employed in most of today's "wireless" charging devices and accessories. There are two major standards in the space: Qi -- named for a Chinese word that means energy and is pronounced "chee" -- and Powermat.

Both standards are also working to incorporate magnetic resonance technology, which could charge over distances of up to 4 centimeters. That would, for instance, mean that aligning your phone to the charging pad "sweet spot" would be less of a hit-and-miss affair, or that the charging pads could be hidden behind thin layers of wood or plastic.

Qi has been incorporated into phones from a variety of manufacturers, and McDonald's has built Qi-compatible chargers into the furniture at its restaurants. Powermat-infused tables, meanwhile, can be found in some Starbucks and airport lounges.

The rivals are backed by two opposing standards organizations, too: The Wireless Power Consortium for Qi, and the AirFuel Alliance for Powermat. The latter was formed when Powermat and its Power Matters Alliance merged with a third, rival wireless standard(confusingly called the Alliance for Wireless Power, or A4WP) in 2014.

The good news is that the rivalry has been less of a zero-sum game in recent years. Samsung, for one, has made its recent high-end Galaxy iphone replacement (including the S7 and S8) compatible with both inductive charging standards, so you can juice it up on a Qi-powered counter at McDonald's and a Powermat-powered one at Starbucks.

'True' wireless charging: Energous and Powercast

Forget about 4 centimeters. How about charging from a distance of 4 meters? Or anywhere in an average-size room?

It's a pretty recent concept, but companies like Energous and Powercast are producing technology that can more accurately be called wire-free. Both use radio frequency (RF) energy, a charging method that works similarly to Wi-Fi, that enables devices to charge when within the range of a power transmitter.

Energous is the developer of WattUp, the wire-free technology that the company claims is capable of charging anything from a mobile device to various wearables like a hearing aid when located up to 15 feet (about 4.5 meters) from the transmitter. The first wire-free transmitter is expected to hit the market before the end of the year, according to CEO Stephen R. Rizzone.

"Besides mobility, the idea of charging at a distance is very, very important to IoT devices," said Rizzone. "Now what's happened, is that you no longer have to run a cable to them, nor do you have to have a large battery, that either has to be replaced or somehow recharged. You can have a much smaller battery because you're continually getting power from these transmitters."