The 3.7V Li-Ion battery inside the Galaxy Tab lists a capacity of 14.8 Watt-hours or 4000 mAh.

Samsung claims that the battery provides enough juice to watch seven hours of movies.

Weighing in at 81 grams, the Galaxy Tab's battery is about 55% the weight and 60% the capacity of the iPad's hulk of a battery.

As highlighted in the third picture, the Galaxy Tab's battery is approximately half the size of the iPad's battery.