Not your fault, the Hero3 battery isn't holding well for most people, specially when you use the higher resolutions. Here are some test results from someone on another board testing the Hero3 Black:
Quote:
HD3b firmware HD3.03.01.09
no bacpac wifi off 2.7k30T PT ON cam raw video test 1h14m.25s 23.4GB
Batt Bacpac wifi off 2.7k30T PT ON cam raw video test 1h49m.43s 35.9GB
LCD bacpac wifi off 2.7k30T PT ON cam raw video test 0h56m.50s 17.9GB
Batt Bacpac wifi off 1080p30n pt off video+photo @ 5 sec 3h18m.27s 27.8GB + 2,379 photos 867MB
no bacpac wifi off 1080p30n pt off video+photo @ 5 sec 1h56m.32s 23.4GB + 1,377 photos 368MB
LCD bacpac wifi off 1080p30n pt off video+photo @5 sec 1h18m.55s 11.0GB + 944 photos 297MB
no bacpac WiFi On 1080p30w pt off video test 1h28m.44s 12.4GB
no bacpac wifi off 1080p30w pt off video test 1h33m.35s 13.1GB
no bacpac wifi off 1080p30Tw PT ON video test 1h31m.18s 22.3GB
Batt Bacpac WiFi On 1080p30w pt off video test 2h37m.35s 22.1GB
no bacpac wifi off 1080p60w pt off video test 1h10m.47s 14.8GB
no bacpac wifi off 1080p60m pt off video test 1h10m.59s 14.9GB
no bacpac wifi off 1080p60n pt off video test 1h22m.59s 17.9GB
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Hope it helps!