Wireless technology has become a new emerging technology in healthcare industry. Efforts have been made by many researchers to integrate Zigbee wireless network transponders with sensors to measure patients' temperature, heart rate, oxygen saturation, respiratory rate and etc. and monitor them continuously from remote locations in hospitals. This transponder requires internal power supply or battery to run its internal circuitry. It was found that life time of the battery is one of the major issues in the monitoring device as it uses certain amount of power to power up components in the device. This may cause interruption in the monitoring process that leads to serious consequences. This work is discussing on the design and implementation of external powering mechanism using rechargeable battery to replace the conventional lithium coin cell battery that can only sustain for few hours if continuous monitoring is implemented. Prototype to recharge the battery externally using USB input was developed and was tested using three different types of batteries. Each battery is connected in with the transponder for powering and also to the recharging circuit prototype to test whether sufficient power and current is provided to power it up. Their performances were observed based on the applicability, lifetime, size, cost and efficiency. It was found that 3.7V lithium polymer battery is giving optimum performances and is proposed as external power source for developed Zigbee transponders. © IDOSI Publications, 2014.