The medical battery (1) includes a battery cell (23) that can be charged and discharged, and a first electrode (21) and a second electrode that are connected to the battery cell and electrically connected to an external electrode in a non-contact state. (22), a battery cell, a switching unit (24) provided in the battery circuit including the first electrode and the second electrode, and switching the current flowing in the battery circuit to alternating current or direct current, the battery cell, the first electrode, Insulating housing (10) that hermetically houses the second electrode and the switching unit, heat storage disposed between the inner surface of the housing and the first electrode, and between the housing and the second electrode Part (31).医療用バッテリ（１）は、充電及び放電可能なバッテリセル（２３）と、バッテリセルに接続され、外部の電極と非接触状態で電気的に接続される第一電極（２１）及び第二電極（２２）と、バッテリセルと第一電極及び第二電極を含むバッテリ回路内に設けられ、バッテリ回路内に流れる電流を交流または直流に切り替える切替部（２４）と、バッテリセル、第一電極、第二電極、及び切替部を内部に密閉収容する絶縁性の筐体（１０）と、筐体の内面と第一電極との間、及び筐体と第二電極との間に配置された蓄熱部（３１）とを備える。
