An excellent addition to any GoPro Hero3, it may not double the video time but it will give you a big boost. I found it perfect for snowboarding, where the cold can eat batteries even when nothing is on!
This does make the camera a little bit bulkier and so harder to pivot in some mounts, but in most situations its still perfectly usable and doesn't weigh you down. On the bike it'd be no problem. Great bit of kit and recommend to anyone as the first upgrade for their Hero 3
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