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I own both batteries.
I find the 3400 gives me about 3 times the normal battery. I used it on a cross country trip (about 8 hours with airport waiting) for listening to tunes, watching movies, and playing games. It had plently of juice left when I arrived at my hotel. Very impressive.
Be fore warned - it's thicker (won't fit in a rhino skin) and heavier. But if you need the power, it's awesome.
Good luck.
AW
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