Lithium batteries also weigh less. The Duracell Ultra are 24 grams (0.8 oz) http://www.duracell.com/media/en-US/pdf/gtcl/Product_Data_Sheet/NA_DATASHEETS/MX1500_US_UL.pdf The Energizer Ultimate Lithium are 14.5 g (0.5 oz) http://data.energizer.com/PDFs/l91.pdf On 2011-11-13, at 12:41 PM, Jackie McDonnell wrote: > Energizer Lithium AA Michiel