the efficiency encompasses for example the charging efficiency and the selfdischarge rate durability includes cyclelife shelflife and robustness against misuse among them battery storage systems are popular and are found with a wide range of chemistries due to these different chemistries the efficiency durability bulkiness and cost of batteries vary a lot batteries can be further categorised in normal atmospheric temperature batteries eg leadacid pbacid lithiumion liion nickel metal hydride nimh high temperature batteries eg nanicl or nas and flow batteries eg polysulfurs sodium bromide psb vanadium redox battery vrb or zincbrome znbr