One year ago I remount EVOLV "DNA 30", his "soft cut-off" will be 3.08V (TCM809TVNB71). http://www.alldatasheet.com/view.jsp?Searchword=TCM809TVNB71 http://ww1.microchip.com/downloads/en/DeviceDoc/21661d.pdf Now "Escribe" have "soft cut-off" 3.09V. Good. But all talk "2.5-2.6V". 2.5V is dead battery. I dont understand. We have "GOOGLE", folks. Sorry four my bad english and it is my opinion.