Here are specs for the XBee 802.15.4 (S1) and the XBee ZB (S2) low-power modules. The Pro (high-power) modules require significantly more current in transmit mode. See the Specifications in the product manuals for details,
XBee 802.15.4 or
XBee ZB.
XBee 802.15.4 (S1)
Supply Voltage 2.8 – 3.4 V
Transmit Current (typical) 45mA (@ 3.3 V)
Idle / Receive Current (typical) 50mA (@ 3.3 V)
Power-down Current < 10 μA
XBee ZB (S2)
Supply Voltage 2.1 - 3.6
Operating Current (Transmit, max output power)
40mA (@ 3.3 V, boost mode enabled)
35mA (@ 3.3 V, boost mode disabled)
Operating Current (Receive)
40mA (@ 3.3 V, boost mode enabled)
38mA (@ 3.3 V, boost mode disabled)
Idle Current (Receiver off) 15mA
Power-down Current < 1 µA @ 25°C