I took two Olympus OEM batteries along with my E-M1 to a recent 3-day trip to NYC. To my surprise, by the end of second day, both batteries were completely drained with only 225 frames and about 10-minutes of video on the SD card. Luckily B&H was nearby and the rest is history. Just wondering if this is considered as normal life for the batteries (manufacturing date - 9/2012 and 8/2013)? DP Review says 330 shots per charge but not sure if it was in the real world. Perhaps I should have left rear LCD screen off at all time? Please share your experiences. Thanks!