Energy Scavenging = Critical Enabling Technology to achieve “No replaceable batteries”
Possibilities include:

• Photovoltaic (Solar)
• Vibrations
• Air Flow
• Temperature Gradients
• Pressure Gradients
• Human Power

Develop an infinite-life power source for Demand Response wireless temperature sensor nodes by using piezoelectric materials to convert ambient environmental vibrations to usable low-level electricity, thus eliminating the need for batteries as primary power storage

research on using Piezo Benders, Picocubes, and others