A review by Bill Bennett for Scoop Techlab
Nokia Lumia 920 with wireless charger
There’s a lot to be said for getting wires out of the way of digital devices – for one thing it makes them mobile. A
smartphone wouldn’t be much use if you needed to jack it in every time you make a call or check Facebook. And let’s not
forget Mobile networks, Wi-Fi and Bluetooth all cut down the need for cable spaghetti.
Despite all this, you still need to connect a phone to a wall socket to give them juice. At least you did. That’s about
to change with wireless charging.
Nokia is the first phone maker to deliver a smartphone that can recharge its batteries without being plugged in. In
fact, there’s no longer any need to physically connect a cable to the Lumia 920.
This is done by magnetic induction. Induction tops up your phone battery when the charging pad converts current into an
alternating electromagnetic field. The phone then converts this back to a current to charge the battery. If that sounds
too complex, just remember it’s the same as the charging technology used by wireless toothbrushes.
Hot stuff
Nokia’s wireless charging is about 90% as efficient as using a wire charger and some of the lost energy converts to heat
– this means the phone can get warm during charging. In testing I found the phone was noticeably warm, but not
alarmingly hot. Certainly nothing like enough to burn.
It’s a simple enough business – although as we will see there are traps for young players.
Nokia’s DT-900 charging plate is a little smaller than the Lumia 920. It comes with a weirdly wide electrical plug – if
you use a multi-socket or a distribution board it has to sit in the left-most outlet. This connects to the plate. You
simply sit your phone on the plate to start charging. A white LED lights on the plate and the phone bleeps to let you
know everything is working.
What could possibly go wrong? Well, for the first day I had the device I thought it wasn’t working because I was using
the plate upside down. The orientation isn’t immediately obvious – in fact, counterintuitively, the bottom face is
slightly smaller than the top.
Simple
With that confusion behind me it was all plain sailing. Or should that be plain charging? I found it takes slightly
longer to charge using the plate than a direct cable – but only a few minutes. The phone can go from almost discharged
to a full charge in under two hours.
Nokia’s documentation says you can leave the pad switched on when you’re not charging as it draws hardly any power when
not in use. If that bothers you, then it’s not hard to flick the wall switch.
Easy, not entirely wire free
Not entirely wire free
To be blunt, placing the phone on the mat isn’t that much less effort than plugging in a cable. And let’s face it, the
charging plate has wires, so you’re not entirely wire free. But there’s no need to worry about having the right cable –
I’ve six incompatible USB connectors sitting my desk drawer, finding the right one in a hurry can be stressful.
The good news is that Nokia’s charging plate uses the Qi standard. That means it’ll work with other devices. It’s still
early days for Qi, other phone makers are preparing to launch Qi models and over time you’ll see tablets and other
gizmos built around the same standard. Even better news is there are plans to install Qi charging mats in public places
– so you’ll be able to charge while on the move. There’s no news on when or if these public chargers will reach New
Zealand.
Content Note: This post has been enabled by Telecom NZ , but the thoughts are the blogger’s own. Find out more about the Nokia Lumia 920 here you can find our more about Windows 8 on the Telecom Network here. Scoop TechLab is a project of Scoop Independent Media www.scoop.co.nz. It is edited by Scoop Editor Alastair Thompson.