An American technology company claims to have developed a new type of electric car battery that can add up to 50% more range without any increase in size. By eliminating all these supporting structures, 24M said manufacturers will be able to "achieve the highest energy density" possible. Ultimately, ETOP allows a claimed 80% of a battery's volume to be made up of electrodes, compared with what 24M said is "the 30% to 60% of traditional battery packs". As a result, a given battery can be dramatically increased in capacity but occupy the same physical space - and another result of the material savings, 24M claims, is that an ETOP battery is also cheaper to build. Crucially, 24M said the relative similarity of its technology to today's conventional battery structures means that it would require only "modest capex investments" for vehicle manufacturers to start using ETOP batteries.