Lithium p7 batteries excel due to their power density their long life long storage life can be stored for up to 15 years they have been optimised for digital devices and keep the power levels high this makes the batteries excellent for long term use material li fes2 aaa size 100 mm diameter 4400 mm height aa size 140 mm diameter 5000 mm height temperature 20c to 60c the lithium battery p7 is approx 33 lighter than a normal alkaline battery