A liquid cartridge comprising: a first outer face; a second outer face opposite the first outer face; a liquid chamber (35, 36) positioned between the first outer face and the second outer face and storing liquid therein, wherein the liquid has a first specific gravity; a liquid supply portion positioned at the first outer face and configured to supply the liquid from an interior of the liquid chamber (35, 36) to an exterior of the liquid chamber (35, 36); a partitioning wall partitioning the liquid chamber into a first liquid chamber storing a first initial amount of liquid and a second liquid chamber; a communication path through which the liquid can flow selectively from the first liquid chamber to the second liquid chamber; a blocking member configured to selectively block communication between the first liquid chamber and the second liquid chamber through the communication path, such that the liquid is selectively prevented from flowing from the first liquid chamber to the second liquid chamber through the communication path wherein the second liquid chamber has a space to be filled with liquid when communication between the first liquid chamber and the second liquid chamber is established by the blocking member selectively unblocking communication between the first liquid chamber and the second liquid chamber through the communication path; and a first movable member comprising a detection portion and a float, wherein the float has a second specific gravity which is less than the first specific gravity, characterised by the first movable member is positioned in the second liquid chamber. a first outer face; a second outer face opposite the first outer face; a liquid chamber (35, 36) positioned between the first outer face and the second outer face and storing liquid therein, wherein the liquid has a first specific gravity; a liquid supply portion positioned at the first outer face and configured to supply the liquid from an interior of the liquid chamber (35, 36) to an exterior of the liquid chamber (35, 36); a partitioning wall partitioning the liquid chamber into a first liquid chamber storing a first initial amount of liquid and a second liquid chamber; a communication path through which the liquid can flow selectively from the first liquid chamber to the second liquid chamber; a blocking member configured to selectively block communication between the first liquid chamber and the second liquid chamber through the communication path, such that the liquid is selectively prevented from flowing from the first liquid chamber to the second liquid chamber through the communication path wherein the second liquid chamber has a space to be filled with liquid when communication between the first liquid chamber and the second liquid chamber is established by the blocking member selectively unblocking communication between the first liquid chamber and the second liquid chamber through the communication path; and a first movable member comprising a detection portion and a float, wherein the float has a second specific gravity which is less than the first specific gravity, characterised by the first movable member is positioned in the second liquid chamber.