Garmin 701 Tempe

To be clear, you have the smooth side of the battery facing down, away from the front of the sensor? You should see the smaller circle (negative side) facing you as you look down on the battery, sitting in the battery door.
 
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I've been staring at this for three days
 
Contact Garmin. They should replace it (it sounds like it is faulty, after all this). Smh. Sounds like you may have just gotten one made on Friday at 1630.