This past weekend I was flying my Spark out over the Everglades. I was out a distance of about 1,500 feet when the battery indicator showed a red 64% and I received a battery error message. I immediately flew back toward my take-off point in as direct a course as possible fearing that I had a battery cell failure. The drone was fully responsive and as I got closer all of the data/video remained fine, except for the battery which never decreased below 64%. I would be grateful to a senior member if they could look at the attached log to see if the battery developed a problem or what exactly caused the RC to be unable to display my battery or flight time remaining. I would have expected that as I got closer to my landing zone the battery % data would have returned to normal.