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The battery's a Li-ion 3.7V, 930 mAh, 3.5Wh unit.
Here's how the three major handheld gaming devices stack up in the battery department:
PSP Go: 930 mAh, unofficially user replaceable
DSi: 840 mAh, officially user replaceable
iPod touch 3rd Gen: 789 mAh, unofficially user replacable, requires difficult soldering
The PSP wins on capacity, and the DSi wins on serviceability. The touch, well, if you can't say something nice...
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