Alas, the battery is within our reach, but not our grasp: some fairly heavy-duty adhesive holds it fast in place.

Google's official specs put the battery at 6700 mAh. A quick visual inspection verifies this, with a rating of 3.8 V, 6700 mAh, and 25.46 Wh.

For those keeping score, that puts it squarely between the slightly larger iPad Air 2 (with a battery rated at 7340 mAh) and the smaller iPad Mini Retina Display (rated at 6471 mAh).