iFixit has done its teardown of the iPad Air and has found a 32.9 Watt-Hour (WHr) battery — a battery slightly larger than what Apple has advertised as a 32.4 WHr battery. It’s a smaller, two-cell battery, compared to the fourth-gen iPad’s 43 WHr three-cell battery. iFixit also confirms that “the speakers have gone stereo” like the iPad mini — the fourth-gen iPad and its predecessors had a mono speaker. Few other surprises…