If you do not know Powermat is a "wireless" charging station. You need the station and you need the unit for your phone.
The stations come in a 3 unit, 2 unit or single mat. You can buy the thing together as in a single mat and phone back or individually.
The idea is instead of having to plug in your phone, you just place it on top and it charges it with almost no wires. Now the problem is unless you have a iPhone chances are you have to use a power cube which means you still have to plug your phone in to a cube. That defeats the whole purpose.
Now i have a Sprint HTC Arrive (Windows Phone FTW) which means they do not have a compatible back plate for my phone.
My phone gets pretty decent battery life and i dont mind charging it at home like i usually do. What i do hate is charging it in my car. So (future upcoming instructable) i thought it would be really cool to have one in my car's center console. But first i need the backing.
Now i looked at others (Energizer, Duracell) and the one that looked the easiest was Powermat. How theirs work is that you replace your battery cover with their cover and you have to kind of keep it plugged it into your usb port to charge like normal.
So first thing you need is to find a powermat phone backing that has the plug matching yours. Easy you think, just about all of them use micro usb now. Ah but HTC has their oriented differently than say Samsung or Motorola, so if you have a HTC phone you need to find the back cover for HTC Evo 4g, because HTC HD2 will not work.
So what you need:
Powermat phone cover
Dremel Drill / Snips of some kind.
Now i got lucky and Best Buy has the HTC Evo 4g backing with the single station for $19.99! Thats like half off! So i bought two. But they are on clearance so be quick.