Here's an interesting tidbit about the new Apple iPad:

The New iPad's Biggest Advancement Might Actually Be Under The Hood

BY A.T. Faust III on Thu March 08th, 2012 battery iPad battery iPad
battery life new ipad the new iPad
from AppAdvice

The New iPad’s Biggest Advancement Might Actually Be Under The Hood

Beyond processor specifications, Apple doesn’t usually have much to say
about the inner goings-on of its iDevice family, and the new iPad has
been no exception. From Apple’s announcement, we knew it would feature a
quad-core A5X SoC, but that’s about all. However, earlier-than-expected
“confirmations” indicate that the included RAM’s been doubled to an
entire gigabyte, and that the battery — previously a 9644 mAh (25Wh)
powerhouse — is now a gigantic 11,666 mAh (42Wh)!

On a practical level, it’s obvious Apple had to introduce a larger
battery to keep the new iPad on track for 10 hours per charge. After
all, that new Retina display sucks down more juice than Mr. Olympia, and
LTE — when enabled — is notoriously hard on energy stores. So, it should
be no surprise that Apple needed to up the battery ante.

What is surprising, however, is that Apple managed this drastic
improvement while barely increasing the overall size of the iPad itself.
And, since last year’s model was nearly all battery to begin with, this
means Apple has made quite the industrial breakthrough. Like ZDNET tells us,

*It suggests that Apple has managed to increase significantly the
power density of the Li-ion cells that it uses. In an industry that has
seemed stagnant for some time now, this is quite an achievement and goes
to show that Apple’s battery research labs and manufacturing plants have
been hard at work. There’s no doubt that we’re going to be seeing the
fruits of this labor in other Apple products soon.*

What’s more, these advancements are likely proprietary, protected
properties, meaning the Cupertino company has yet another strategic
advantage over its computing competition. It’s been a long time coming,
but battery life — at least for Apple products — may finally give up its
crown as mobile technology’s single largest limiting factor.

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I like this...advances in batteries...