A measurement system (1, 3; 5) comprising: a battery pack containing a battery; and at least one type of connected device (3; 5) to which the battery pack is to be connected, wherein the battery pack includes a first detection device that is configured to detect a predetermined physical quantity in the battery pack and that has a predetermined measurement range, wherein the at least one type of connected device (3; 5) includes a second detection device (34; 54) that is configured to detect a physical quantity and that has a measurement range different from the measurement range of the first detection device, wherein the physical quantity is the same as the predetermined physical quantity, wherein one of the battery pack and the at least one type of connected device (3; 5) is a first device, and the other of the battery pack and the at least one type of connected device (3; 5) is a second device, the first device including: a receiving device configured to receive a detection-value-related information that is transmitted from the second device and that directly or indirectly indicates a detection result by one of the first detection device and the second detection device (34; 54); and a measurement processing device configured to perform a predetermined measurement process by using one of: the detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device (34; 54), the one device being provided in the first device, and wherein the second device includes a transmission device (33; 53) configured to transmit the detection-value-related information to the first device. a battery pack containing a battery; and at least one type of connected device (3; 5) to which the battery pack is to be connected, wherein the battery pack includes a first detection device that is configured to detect a predetermined physical quantity in the battery pack and that has a predetermined measurement range, wherein the at least one type of connected device (3; 5) includes a second detection device (34; 54) that is configured to detect a physical quantity and that has a measurement range different from the measurement range of the first detection device, wherein the physical quantity is the same as the predetermined physical quantity, wherein one of the battery pack and the at least one type of connected device (3; 5) is a first device, and the other of the battery pack and the at least one type of connected device (3; 5) is a second device, the first device including: a receiving device configured to receive a detection-value-related information that is transmitted from the second device and that directly or indirectly indicates a detection result by one of the first detection device and the second detection device (34; 54); and a measurement processing device configured to perform a predetermined measurement process by using one of: the detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device (34; 54), the one device being provided in the first device, and a receiving device configured to receive a detection-value-related information that is transmitted from the second device and that directly or indirectly indicates a detection result by one of the first detection device and the second detection device (34; 54); and a measurement processing device configured to perform a predetermined measurement process by using one of: the detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device (34; 54), the one device being provided in the first device, and the detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device (34; 54), the one device being provided in the first device, and wherein the second device includes a transmission device (33; 53) configured to transmit the detection-value-related information to the first device.