We currently only have a 2Gb card installed in our camera, which we now know needs to be replaced with an 8Gb for launch. Our test shows that we will use around 2Gb every 50 minutes - so we could theoretically get 200 minutes of footage with the higher capacity card. In reality though the batteries would not last for 200 minutes (and we expect our payload to have returned to Earth within 100 minutes).
Although not a 100% realistic test, for one I had to delete the contents of the memory card and restart the script, the battery lasted two full cycles. The CHDK/SDM software suggested there was still around 20-25% battery life left at the end of this test - a good indicator that we will have power for the entire duration of our flight.
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