A battery pack with a housing and a plurality of cells disposed in the housing and electrically coupled to provide a storage capacity between about 2.17 and 2.67 ampere hours with an equivalent lithium content between about 6.5 and 8.0. The plurality of cells includes a first battery disposed in the housing and including a first plurality of cells connected in series and a second battery disposed in the housing and including a second plurality of cells connected in series, wherein the first battery and the second battery are operable in a storage mode and a use mode.