The bottom panel contains an integrated 6 cell Li-Polymer battery pack.

The 11.1 V battery is rated at 40 Watt hours, an improvement over the MacBook Air's 7.2 V, 37 Watt hour battery. (Dell's manual says 12.6 V, but we trust the battery more than their writers.)

The Adamo's advertised operating time is 5 hours, outliving Apple's claims for the MacBook Air by 30 minutes.

According to the manual, the battery weighs in at 489 grams. That's 27% of the Adamo's weight. In comparison, the MacBook Air's battery weighs in at 287 grams, only 21% of the Air's total weight.

You can recycle the battery... in Japan.