It is very important to explore cost-effective, high capacity and stable anode materials for lithium ion batteries from earth-abundant resources. Here we report a facile ball-milling method to prepare Mn3O4/CNT nanocomposites from some waste resources like  amorphous manganese oxide from recycled batteries or from electrolytic manganese industry. The obtained Mn3O4/CNT nanocomposites were intensively investigated as anode materials for lithium-ion batteries and supercapacitors. In these Mn3O4/CNTs nanocomposites with a unique bird nest architecture, the CNTs work as electrical wiring branch. This provides electron efficient transport pathway and accommodate a large volume change during the electrochemical reactions. While the ultrafine Mn3O4 nanoparticles grafted onto the CNTs ensure high specific capacity. Therefore, exceptional high capacity (>1000 mAh g-1) and extremely stable cycling were achieved.