yrannadx, if Your chip wasn't calibrated for 2000 mAh or more (as magick777 suggested), and You're sure that no other tricky glitch invalidated Your calibration, there can be only one answer - relative capacity of this battery (for Your use case) is that high.

Let me remind one thing - there is no such thing as absolute capacity of any battery, especially, LiIons. Measured capacity (properly called "relative") depends on many factors - discharge current, temperature, etc. In case of non-constant discharge current (like in any real-life use case for computers or phones, where You have different current usage every second, from 4-7 mA standby, to ~700 mA under heavy usage), it also depends on ratio of "high current "spikes" to low current ones, and even state of Charge, at which such spikes appear.

As a result, using device with lower current, or with more cells at one (like in dual-battery mod, where current for every cell is halved), you will get better capacity than expected.
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That said, it's still quite surprising (not to say doubtful) result. Using dual-scud, which should total @ ~3000 mAh when new, my biggest results - due to moderate usage and benefits of dual-cell layout - were around 3150 mAh. It means, that due to mentioned benefits, my relative capacity was 150 mAh higher than expected (75 mAh per cell) - not anything groundbreaking, yet, still, nice to have.

In Your case, last report is 225 mAh *more* than expected, for 1500 mAh, single-cell battery, used heavily, as You said. That result would be ground-breaking, and would require ultra-low internal resistance inside polarcells, + some other voodoo doing its job.

While I remember shadowjk mentioning very good (low) internal resistance of polarcells (or was it japod? ), it's still hardly to believe *so good* results.
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Summary - I have no idea WTF Give it 2-3 more calibrating shots, and keep us reported. It's very intriguing.

/Estel