Some other markings on the battery:

APN: 616-0447

VPN: DAK 120670-01HH00LH

The small black box in the second picture is one of the WiFi antennas.

Hopefully the WiFi reception will be decent, as the back of the iPad appears to be a single block of aluminum. In addition to the antenna mentioned above, the Apple logo in the center of the rear case also serves as a window to allow for the transmission/reception of RF signals. We saw Apple do this on the newest iMacs.