The battery powered tractor cartis mainly applied in assembly line(ring production line,loop production line),metallurgy industry(steel lade),warehouse transport,ship industry(maintenance, assemcle,container transport),work piece transport in workshop,lathe transport,steel factory(steel billet,steel plate,steel coil,steel pipe,section steel structure),construction(bridge,simple building,concrete column,)petroleum industry(oil pump,sucker rod and parts),energy(polycrystalline silicon,generator,windmill),chemical industry(electrolytic cell,retort etc),railway(rail maintenance,rail welding,train tractor).