[Xperia Z1 Accessories] raginginferno:
Just agreeing with the others. I have to say the "Magnector X" connector is a awesome magnetic connector.

http://magnector.com/?product=magnector-x-cablesony-xperia-magnetic-cable

It is defiantly the strongest magnet I can find. It's way better than any of the ones I bought on ebay. I have one that says "Sony" on the connector, some random one with a square logo on and even a random one that is essentially a micro usb to magnetic charger adapter from the big Yodobashi store in Tokyo. They all suck with weak magnets.

Magnector X is stronger for sure but you still can knock it off if you hit the connector with a decent amount of force that is perpendicular to the way it sticks on. It's better than the weak ones. I can actually pick it up with out worrying about disconnecting it like the others. Also I have this:

http://www.powerpractical.com/product/practical-meter

It's pretty much a power meter for usb chargers. I've attached it to the Magnector X with a Sony 2A wall charger. It shows the phone will draw a full 5W/1000mA from the actual charger. I don't think the Sony phone can actually draw more than 5W/1000mA. I've never been able to do so. (I am running Cyanogenmod... maybe stock can do more). Magnector X actually is a fairly thick cable. Some of the ebay ones are thin and charge like crap. But even so with this connector I've done some heavy loads on this phone like Google Maps with guidance, and it has managed to keep charging the phone (very slow charge and assuming it doesn't get too hot and the safety kicks in to prevent charging).

Great cable, highly recommend it! Don't bother with the others! Not worth it! It charges properly and sticks better then the rest! A bit on the expensive side, like $25 after shipping.

As for the case issue, yes Magnector X does have a bit of a lip on each side to help it form to the phone a little better and help prevent accidental knock off (sort of... just a little bit). So if you use it with a case you have to make sure you have enough clearance on the side of the charging port. But I did the mod I believe it was mention in this thread earlier (or maybe another thread). I have the Case Mate Tough Case on the Z1.

http://www.case-mate.com/Sony-Xperia-Z1-Cases/Case-Mate-Sony-Xperia-Z1-Tough-Cases.asp

Love the case, good protection for such a thin, armor style case. Doesn't have a charging port. So I took an Exacto knife and just carved out the opening I needed. The soft silicon part was pretty easy to cut. The harder plastic (which is more of a soft plastic, not a hard stiff plastic like otter box for example), I just kept scoring at it until I was able to cut out the piece that I wanted. You can see in the picture I over did the harder plastic a little bit to the left. Otherwise I managed to cut it not too bad without making a huge mess out of it. The Magnector X will connect to it, I just have to make sure the lips of the Magnector X it tucks under the red softer silicon properly and it will charge no problem. Not too hard to do.

SIDENOTE:

Thickness of the USB Cable matters for how fast it can charge. The charging wires need to be thicker copper. If you need cheap regular micro USB cables that actually charge very well, check out monoprice. You have to make sure they say 28/24AWG. The 24AWG portion means the charging wires are way thicker than generic garbage cables. I've tested these cables as well. Charges 5W/1000mA on my Z1 and way more than than on a USB battery pack which needs way more power to charge. Plus these are just good cables in general. Comes in many lengths, very thick and also gold plated (doesn't help with charging but the connectors won't rust on you)

http://www.monoprice.com/Search/Index?keyword=micro+usb+28/24