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I'm also a bit worried about the batterylife. I just got my H3D II and I've done testshooting. Next week I should so some customer works with it. One of my collegues told me that the body should be reset to recognize a full battery by pushing 2 buttons down while inserting a new fully charged battery. I can't find any innformation about that anywhere and can't remember which buttons I should press. Can any one help me or is this just the case that is fixed described by "fotografz"?
I got 2 batteries and the 123 batterygrip and it might be that a should do full day shoots without the posibility to connect to a computer.
All of these MFD cameras and backs are sensitive to low power ... I usually swap batteries as soon as it shows 3/4 or below. A low battery is the cause of most issues while shooting.
I just did an 8 hour industrial shoot and swapped batteries mid day and finished out with the second battery. About 400 shots with use of the flash on a few plus lots of LCD reviews and resetting ISOs/WB.