  Operation of an atomtronic battery is demonstrated where a finite-temperature
Bose-Einstein condensate stored in one half of a double-well potential is
coupled to an initially empty load well that is impedance matched by a resonant
terminator beam. The atom number and temperature of the condensate are
monitored during the discharge cycle, and are used to calculate fundamental
properties of the battery. The discharge behavior is analyzed according to a
Th\'{e}venin equivalent circuit that contains a finite internal resistance to
account for dissipation in the battery. Battery performance at multiple
discharge rates is characterized by the peak power output, and the current and
energy capacities of the system.
