Provided is a self-propelled lawn mower that can reliably charge a storage battery as compared with the prior art and is advantageous for cost reduction. The self-propelled lawn mower 1 has charging terminals 10 a and 10 b on the main body 2 that can be connected to and disconnected from the DC output terminals 51 and 52 of the charging base 50. In the self-propelled lawn mower 1, the charging circuit 13 boosts or lowers the DC 21 V between the charging terminals 10 a and 10 b according to the rated output voltage of the storage battery 30, and the storage battery 30 with a charging voltage that matches the rated output voltage of the storage battery 30. To charge. The control unit 15 receives an identification signal of the type (rated output voltage, etc.) of the storage battery 30 from the T terminal, and controls the charging circuit 13 to perform a charging operation with a voltage that matches the rated output voltage of the mounted storage battery 30. To do.従来と比較して蓄電池を確実に満充電にすることが可能で低コスト化にも有利な自走式芝刈機を提供する。自走式芝刈機１は、充電ベース５０の直流出力端子５１，５２と接続、離脱可能な充電端子１０ａ，１０ｂを本体２に有する。自走式芝刈機１において、充電回路１３は、蓄電池３０の定格出力電圧に応じて充電端子１０ａ，１０ｂ間のＤＣ２１Ｖを昇圧又は降圧し、蓄電池３０の定格出力電圧に適合する充電電圧で蓄電池３０を充電する。制御部１５は、Ｔ端子から蓄電池３０の種類（定格出力電圧等）の識別信号を受信し、装着された蓄電池３０の定格出力電圧に合わせた電圧で充電回路１３が充電動作を行うように制御する。
