The "Battery Meter" problem should be fixed with a few charge discharge cycles, the chip in the charge controller needs to relearn the capacity. As for being dangerous, it should be fine if he doesn't damage it, and the extra batteries aren't made by Sony. He is no doubt using the charge controller cicuitry from an original battery, which aside from being meant for less cells (long recharge time) should work without any problems.
For those looking for a device strictly for reading, the new Kobo is a nice little option. It's small enough to slip into a pocket, can do more with a PDF than the competition, and at $129, it's $10 cheaper than both the Nook and Kindle WiFi.
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The "Battery Meter" problem should be fixed with a few charge discharge cycles, the chip in the charge controller needs to relearn the capacity. As for being dangerous, it should be fine if he doesn't damage it, and the extra batteries aren't made by Sony. He is no doubt using the charge controller cicuitry from an original battery, which aside from being meant for less cells (long recharge time) should work without any problems.