There are 1.5V lithium batteries, such as Energizer Ultimate Lithium AA and AAA batteries. These can provide significantly longer life as well as offer other benefits:
http://www.energizer.com/products/li...batteries.aspx
http://data.energizer.com/PDFs/l91.pdf
http://data.energizer.com/PDFs/lithiuml91l92_appman.pdf
Last edited by Looigi; 10-16-11 at 12:32 PM.