A simple design of Thermal Energy Harvesting(TEH) device consists of Thermoelectric Generator(TEG), DC-DC booster converter, electrical energy storage and DC output port source is developed. This TEH device has a capability to capture and collect heat waste that spread freely into surrounding, convert into electrical energy and can be used for low power device applications. This thermal energy harvesting device will hold a promise for electronic device applications, hence replacing batteries with benefit of green technology, environment sustainable, less maintenance and less cost.