I find that the RTL510 battery level display on my Garmin Edge 530 is not quite linear. Fully charged, the battery icon displays 5 bars. When the battery level is down to 2 bars, typically I do not get more than a couple of hours out of it in day flash mode. If the battery life is up to 15 hours in day flash mode, one would assume when the battery indicator shows 2 bars, you should have about 6 hours of use remaining. Is there a ConnectIQ widget that displays the RTL510 battery life in percentage?