Never mind battery life - how about no batteries?

EnOcean uses energy harvesting to provide these control functions, the power used to press the switch generates the energy to transmit. Hundreds of thousands of these switches are already used around the world, yet this article omits them. www.enocean-alliance.org - most of the existing switch manufacturers have already adopted this technology, not many have ZigBee, Z-Wave or Wibree products.