Garmin 910XT Battery Life

I'm currently using a Garmin 910 XT to record my data.  One thing I have noticed recently is the battery display you get when switching off the device is a little misleading.



The picture on the left is the display I got before my run on Friday night.  The picture on the right is the view before my run on Sunday.  Between to two pictures I ran for two and a half hours and then swtiched the watch off between runs and no charging.  I believe the empty battery image happens at around 15% - 20%.

My Sunday run was 90 mins and the watch did bleep to alert me of the low battery  (10%) during this run.  But but even after my run the battery had only reduced to 7%.  Between getting the empty battery and finishing my Sunday run I had run for 240 mins in all and still had 7% battery left.






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