Power supply unit for aerosol generation device

A power supply unit for an aerosol generation device, the power supply unit comprising:

• a power supply;
• a first connector electrically connectable to an atomizer capable of atomizing an aerosol source and electrically connected to the power supply;
• a second connector electrically connectable to a heater capable of heating a flavor source that adds a flavor to an aerosol generated from the aerosol source, and electrically connected to the power supply;
• and
• a processing device,
• wherein the processing device is configured to
• generate the aerosol to which the flavor is added by controlling discharge from the power supply to the atomizer and the heater,
• acquire a remaining amount of the flavor source at a first timing after generation of the aerosol to which the flavor is added as a first remaining amount, and
• acquire a second remaining amount, which is a remaining amount of the flavor source at a timing between the first timing and a second timing when next generation of the aerosol to which the flavor is added starts, as an amount smaller than the first remaining amount.