I was wondering if someone could answer in words not data what advantages energizer e2 lithium batteries offer over regular alkaline cells. More specifically is the difference in both power and energy capacity noticeable to make a significant difference? Also I have read numerous threads which give various voltage readings concerning the e2 battery. The box states 1.5 volts but other sources state 1.7 or #'s between 1.5 & 1.7. I appreciate the help.