A tool main body comprising an electrical load, the tool main body comprising a battery meter for use with a rechargeable battery configured to supply power to the electrical load, the battery meter comprising: a voltage measurement unit for measuring an inter-terminal voltage (Vt) of the rechargeable battery; an announcement unit for announcing rechargeable battery remaining capacity information based on the measurement of the inter-terminal voltage (Vt); and an announcement request switch for outputting an announcement request for requesting announcement of the remaining capacity information, wherein: the announcement unit is configured to announce the remaining capacity information when the announcement request is received during a period in which the electrical load is not supplied with power, and wherein the tool main body is characterized in that the announcement unit is configured to not announce the remaining capacity information regardless of whether or not the announcement request is received during a period in which the electrical load is supplied with power, wherein the tool main body is further configured such that, during a period in which the electrical load is not supplied with power, at each of times (t32, t33) when the announcement request switch is pushed, the announcement request is provided to the announcement unit and the remaining capacity information is updated at each of the times even if a period between two times when the announcement request switch is pushed is shorter than a set announcement period (Tx). a voltage measurement unit for measuring an inter-terminal voltage (Vt) of the rechargeable battery; an announcement unit for announcing rechargeable battery remaining capacity information based on the measurement of the inter-terminal voltage (Vt); and an announcement request switch for outputting an announcement request for requesting announcement of the remaining capacity information, wherein: the announcement unit is configured to announce the remaining capacity information when the announcement request is received during a period in which the electrical load is not supplied with power, and wherein the tool main body is characterized in that the announcement unit is configured to not announce the remaining capacity information regardless of whether or not the announcement request is received during a period in which the electrical load is supplied with power, wherein the tool main body is further configured such that, during a period in which the electrical load is not supplied with power, at each of times (t32, t33) when the announcement request switch is pushed, the announcement request is provided to the announcement unit and the remaining capacity information is updated at each of the times even if a period between two times when the announcement request switch is pushed is shorter than a set announcement period (Tx). the announcement unit is configured to announce the remaining capacity information when the announcement request is received during a period in which the electrical load is not supplied with power, and wherein the tool main body is characterized in that the announcement unit is configured to not announce the remaining capacity information regardless of whether or not the announcement request is received during a period in which the electrical load is supplied with power, wherein the tool main body is further configured such that, during a period in which the electrical load is not supplied with power, at each of times (t32, t33) when the announcement request switch is pushed, the announcement request is provided to the announcement unit and the remaining capacity information is updated at each of the times even if a period between two times when the announcement request switch is pushed is shorter than a set announcement period (Tx).