correspondingly increasing the capacity of the inner surface of the battery can 10 to contact the electrochemical materials housed therein in this manner the energy density of the battery can 10 is similarly increased moreover it will be readily appreciated that by forming the lands 18 and the grooves 16 as best seen in fig3 in a substantially uniform and repeating continuous pattern 14 as well as extending them substantially the entire longitudinal length of the battery can 10 the lands 18 and grooves 16 not only increase the internal surface area of the battery can 10 but do so in a manner which effectively maximizes any such increase in internal surface area thus the particular configuration of the lands 18 and the grooves 16 depicted in fig1 and 2 not only increases but serves to maximize the amount of potential contact between the inner surface of the battery can 10 and the active electrochemicals housed therein in a preferred embodiment of the present invention approximately 100 to approximately 150 grooves 16 and a separate but substantially equal number of lands 18 may be formed about the inner surface of the battery can 10 assuming a standard aa sized battery more preferably approximately 120 grooves 16 and 120 lands 18 are formed on the inner surface of the battery can 10 for a standard aa sized battery it will be readily appreciated that a correspondingly greater or lesser number of lands 18 and grooves 16 may be formed in batteries of differing sizes from that of a standard aa type battery in dependence upon the actual.