Secondhand purchase 225xe

There are currently very cheap annual cars from mid-2018 with good equipment (sports seats, LED and parking doors front and rear, panoramic roof) around 25000Euro. These vehicles do not have the new battery cells of the model car 2020, which enable the 40.50km pure electric driving real, for a good price. And 30km are also good. Is there something special to consider? Do these 2018 models also get the E license plate or is the equipment dependent? Co2 or range? Or would you go on the new model, but half-yearly car for 30000 euros?