Packet Loss Ratio (PLR) is one of the key components for the performance enhancement of a Wireless Sensor Networks (WSNs). This paper investigates the PLR at radio receiver for the different current draw parameters: transmit mode, receive mode, and sleep mode and idle mode keeping other parameters like: initial energy and power supply same for all motes. Finally this paper concludes that if the PLR is to be used for the performance enhancement then Z1 mote should be implemented in IEEE 802.15.4 WSNs.