I think you're a little confused about the whole wireless charging thing. Seems like a lot of folks are, so I'll try to explain.
Originally Posted by hink3000
The 920 comes with built-in wireless charging. The 820, 822, and 810 come with NFC capability, but require an optional charging shell for wireless charging.
If you have an 810, wireless charging shells are available in black and Cyan, but are currently pretty difficult to come by. You are correct that the 820, 822, and 810 each use different charging shells.
However, once you purchase a wireless charging shell, you have several options for charging your phone. In fact, the 920, 820, 822, and 810 can use any charger supporting the Qi standard. These include Nokia's charging plate, the charging stand, and the JBL stereo with Qi charging built in. And, any other-branded Qi chargers, such as the energizer charger referenced above, will also work.