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Join Date: 2nd April 2012
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Just thought I'd update with some info that may be useful if anyone is in the same situation...
OEM battery on my 2009 FN2 was a Furukawa. No idea what the specs of this are as I can't see them written on the battery. In the end I went for a Bosch S4. Euro Car Parts lists both the S4 158 and S4 159 as being compatible with the FN2. The 158 is the correct one. The 159 has the terminals the wrong way round (Positive on the left, Negative on the right - as you look at the battery, with the large edge with the terminals on closest to you).
From what I can gather, 158 is the type of battery and 021 is the Bosch part number - the 158 battery I ordered has "S4 021" written on the label - if you enlarge the image on Euro Car Parts, you can see this.
The terminals are a little more raised on the OEM Furukawa than the Bosch - there's a little plastic raised bit before the terminal starts which the Bosch doesn't have. As a result, I had to remove the big plastic cover that fits over the battery (the large black cover that goes around and over the whole battery, not the terminal covers). There were no issues tightening the clamps though, and the Bosch battery fits and works fine.