While most IoT attention is focused on high-volume markets served by standards-based solutions, many large market niches exist for where it is crucial to support wireless sensor units which have batteries that are difficult to replace based on how the product is used or physically located e.g., units that are underground or hard-to-reach atop utility poles or buildings. These sensors must operate over extended periods without battery replacement. This session will examine the special needs of wireless applications using coin cell and energy harvesting powered devices.