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3 years is a conservative estimate for when the battery will hold 80% of its original full capacity, which is far from being useless. It could very well still be able to operate at 50% capacity after 10 years, and that's not bad considering that still means at least several days between charges.
Unless you have a faulty battery to begin with it really should be many years before it's an issue. Other components of the device will probably fail before the battery becomes useless.
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