Quote:
Originally Posted by takagari
MAYBE we can fill a 16gb card! 
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16GB is NOT hard to fill at all, especially if recording in 1080p or 720p@60fps, which will take about 1GB for 7-9 min of video.
Thus, a 16GB card is full in 2h.
Considering most games last about 6h of gameplay, with the occasional uninteresting downtime (for video's sake), a 32GB at 4h would be perfect IMHO.
Your only concern then is battery life, which is easy to solve. A single 1050mAh is said to last for 2-3 hours, according to the manufacturer, so a second battery or a usb battery pack like you said would do the trick
Edit: come to think of it, an external batt pack would require having the latch open at all time during its use, which I rather not do, as dust, sand, rain would screw up things nicely. A second battery from ebay woud be the best choice. 15$ for a chinese made one