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It isn't necessarily the battery, though it most likely is as others have said.
The reason I say this is that the Bosch alternator should be putting out a charge of 13.5VDC-14.5VDC. But, it is usually more like 14+ VDC, so your reading is a little lower than expected, but still within range.
This could be caused by the battery, but for peace of mind, I'd first try to charge the battery on a proper charger and then see if it holds a charge. Also, if you later replace the battery, and the alternator reading is still under 14VDC, I'd keep an eye on it because this could indicate trouble with the alternator as well. Not white-hot critical, but it could keep you from becoming stranded in the future or messing up the new battery.
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