Each separate cell lists its rating of 3.78 volts and 14.60 watt-hour. They're graced with some more matrix barcode tags and wonderful inscriptions that read 741-0065-A P11GG9-01-F01TS. Swoon.
Chris Foresman at Ars Technica compared the energy density to the battery in the iPad 2, and it comes out about the same—around 0.0014 watt-hour / mm^3.
Apple physically increased the size of each cell by about 70%, explaining the big jump from 25 to 42 watt-hours.
Apple claims the new iPad is environmentally friendly with a "Recyclable aluminum and glass enclosure." The materials may be recyclable, but the assembled unit is not. We spoke yesterday with Steve Skurnac, president of SIMS Recycling Solutions—one of the largest electronics recyclers in the world. He told us, "Sealed units make it difficult to remove the batteries. From a recycler's point of view, the hazardous components [like batteries] need to be easily separated or removed."
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