I was flying my Inspire today and got a 'Critically Low Voltage' error when my battery was at 45% charge. It was not triggered by distance, and in fact when I landed it next to me it still had the red flashing error at 39% charge. Thoughts? Some more info: - Started the flight with 75% battery. Was last charged two weeks ago. - Recently updated the firmware in the a/c and remotes. Unsure if this could be because I didn't have the firmware file in the SD card.