Went to the range to, "chrony" some new reloads. My first 3 shots recorded about what I expected. However, my next 7 shots were all over the place, from 3500FPS to 1800FPS. The battery has never been removed from the unit since new.Is it possible the battery ran down even though the Chrony wasn't being used?? Also, this was only the 2nd time I have used the unit, (purchased new about 9 months ago).