A riding-type mower, comprising: a body frame ; a seat disposed on the body frame; a mowing unit , comprising a mowing element and a first motor configured to drive the mowing element; a walking unit , comprising a road wheel and a second motor configured to drive the road wheel; and a power supply device mounted on the body frame, wherein the power supply device comprises: a plurality of battery packs configured to supply power to the riding-type mower, wherein at least one of the plurality of battery packs is detachably mounted to the riding-type mower and further configured to supply power to a hand-held electric power tool ; the plurality of battery packs each are provided with at least one battery cell group, and each battery cell group comprises a plurality of battery cells electrically connected to each other; characterized in that the power supply device further comprises a power management module , which is configured to determine whether the plurality of battery packs satisfy a discharge condition, and control a battery pack satisfying the discharge condition to discharge when the battery pack satisfies the discharge condition; wherein the discharge condition comprises that a sum of numbers of respective battery cell groups of all the plurality of battery packs connected in parallel is greater than or equal to 5. a body frame ; a seat disposed on the body frame; a mowing unit , comprising a mowing element and a first motor configured to drive the mowing element; a walking unit , comprising a road wheel and a second motor configured to drive the road wheel; and a power supply device mounted on the body frame, wherein the power supply device comprises: a plurality of battery packs configured to supply power to the riding-type mower, wherein at least one of the plurality of battery packs is detachably mounted to the riding-type mower and further configured to supply power to a hand-held electric power tool ; the plurality of battery packs each are provided with at least one battery cell group, and each battery cell group comprises a plurality of battery cells electrically connected to each other; characterized in that the power supply device further comprises a power management module , which is configured to determine whether the plurality of battery packs satisfy a discharge condition, and control a battery pack satisfying the discharge condition to discharge when the battery pack satisfies the discharge condition; wherein the discharge condition comprises that a sum of numbers of respective battery cell groups of all the plurality of battery packs connected in parallel is greater than or equal to 5. a plurality of battery packs configured to supply power to the riding-type mower, wherein at least one of the plurality of battery packs is detachably mounted to the riding-type mower and further configured to supply power to a hand-held electric power tool ; the plurality of battery packs each are provided with at least one battery cell group, and each battery cell group comprises a plurality of battery cells electrically connected to each other; characterized in that the power supply device further comprises a power management module , which is configured to determine whether the plurality of battery packs satisfy a discharge condition, and control a battery pack satisfying the discharge condition to discharge when the battery pack satisfies the discharge condition; wherein the discharge condition comprises that a sum of numbers of respective battery cell groups of all the plurality of battery packs connected in parallel is greater than or equal to 5. <EOS>