Because Apple realised that a thin and small laptop sells better than a chunky one. Make a Mac Book the sane size as the iBook G3 and you could have a week's wo

Because Apple realised that a thin and small laptop sells better than a chunky one. Make a Mac Book the sane size as the iBook G3 and you could have a week's worth of battery. But then you wouldn't be allowed to carry it on a plane. The limitation is not tecnological, is regulatory.