Panasonic pro power the new generation of high performance alkaline batteries compared to older generations of batteries extreme power gives the new panasonic up to 10 more power this means that you can play your portable devices for longer and not have to worry about the batteries running out the high powered alkaline batteries can be stored for up to 7 years and are the ideal energy source for long journeys etc comes in a saver set of 24 batteries either aa or aaa