SENSING DEVICE AND WEARABLE DEVICE WITH SAME

A sensing device includes a main body, a first battery, a second battery, and a battery switching unit. The first battery includes a power terminal and an ID terminal having a length less than a length of the power terminal. When the battery switching unit detects that the power terminal and the ID terminal are both electrically connected to a connector positioned in the main body, the battery switching unit switches to the first battery and the sensing device is powered by the first battery; when the battery switching unit detects that the ID terminal is just disconnected with the connector, the first battery keeps providing power to the sensing device through the power terminal and the battery switching unit switches to the second battery so that the sensing device is powered by the second battery before the power terminal being disconnected with the connector.