John Galea's Blog

My blog on Gadgets and the like

Wireless charging

With the iPhone 8 and X now supporting wireless, charging (welcome to the game Apple) more people are looking into their options. I fell in love with wireless charging a while back. I’m still on an iPhone 6 so a long time ago I bought a Qi-infinity Wireless Charging case that allowed me to retrofit wireless charging onto the iPhone 6. They have a clever design that the bottom connector slides down to allow access to the lightning port. It works, although not perfect. The case itself is super rigid and has saved my phone on countless occasions.

Back to the wireless charging … So with this case I decided to compare a couple wireless charges. It’s worth noting, that be careful, a number of the super cheap charge pads are single coil devices. This means it has a very narrow magnetic field. So you
have to be super careful with where you put the phone down. I had an early one of these that I paid $3 for and eventually through it out after more than once thinking it was charging and it wasn’t. Most of the charge pads have a light to show you the power is to the charge pad, and a light to indicate it’s charging the phone wirelessly.

It’s worth noting that wireless charge pads are in general slower to charge your phone that by a wired charger, to do with the inefficiencies of wireless charging. The losses involved. They are ideal for overnight charging where the speed of the charge is of little importance.

The first one I tried was a Docooler G300. This turned out to be the slowest of the charge pads I had to try. It charged the iPhone 6 with this case at a rate of 0.375%/hr or a projected full charge of 4.4 hours. Now the speed and amount of time is of less interest than the relative numbers. Your numbers will vary depending on your phone and charge pad.

The second one to try was an Itian Qi. I really like physical layout of this charge pad because it makes it simple to get the phone on the right spot. This charged at a rate of 0.48%/hr or a projected full charge of 3.5 hours. This would make this one 27% faster than the Docooler.

Last up I tried a Seneo Fast Wireless Charger. This one is also a good design for making it easy to get the phone on the right spot on the charge pad. This one charged the fastest at a rate of 0.54%/hr or a projected full charge of 3.1 hours. This one would then be 44% faster than the Docooler.

By comparison a wired charger for an iPhone 6 can deliver about 1%/hr or a projected charge of about 1.5 hours. So you can see what I mean by wireless chargers being slower. You can even see it in the current drawn. The charge case that I bought says right on it that it delivers a max current into the iPhone of .6A, while the power drawn from the USB to give that 0.6A is about 1.2A. In other words you loose about 50% due to the inefficiency of wireless charging. You can see the current and voltage of a USB port by using a USB amp meter like this:

November 2, 2017 - Posted by | Electronic gadget reviews, iPhone Stuff

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