Topic is so dumb. They aren't exaggerated. We know the exact amount of time the battery lasts, and that time is too short for some people's needs. Whether or not you need 3-4 hours is irrelevant. There are tons of people who often ride planes or have long commutes that would want a little more life out of their portable systems. It's not like you can play it until the battery dies anyways. Most of the time you're going to turn it off when you get the low battery warning because you don't want it to shut off while you're still playing..
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