I think this conclusively demonstrates that the DR has a single cell 1300 mAh battery.
Power from single cell 3.7V 1300 mAh battery = 4.8 Watt Hours
Power from four 1.2V PowerEx 2700mAh batteries = 13.0 Watt Hours
This is consistent with 5 hrs vs 12.5 hrs, and also suggests that the DR1000S is drawing about 1 Watt.
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