A surgical instrument system, comprising: a surgical instrument, comprising: a firing member; a motor configured to drive said firing member; and a battery configured to supply power to said motor; a first end effector attachable to said surgical instrument, wherein said first end effector comprises a first set of stored data regarding a first set of end effector parameters pertaining to said first end effector, and wherein said surgical instrument is configured to ascertain said first set of data and enter a first operating state after ascertaining said first set of stored data; and a second end effector attachable to said surgical instrument, wherein said second end effector comprises a second set of stored data regarding a second set of end effector parameters pertaining to said second end effector, wherein said surgical instrument is configured to ascertain said second set of data and enter a second operating state after ascertaining said second set of stored data, wherein said first set of stored data comprises an instruction to limit the power that said battery can supply to said motor to a first power, and wherein said second set of stored data comprises an instruction to limit the power that said battery can supply to said motor to a second power, characterized in that said surgical instrument is configured to enter a default operating mode if said surgical instrument is unable to ascertain a set of stored data from an attached end effector, and wherein said default operating mode comprises limiting the power that said battery can supply to said motor to a default power. a surgical instrument, comprising: a firing member; a motor configured to drive said firing member; and a battery configured to supply power to said motor; a firing member; a motor configured to drive said firing member; and a battery configured to supply power to said motor; a first end effector attachable to said surgical instrument, wherein said first end effector comprises a first set of stored data regarding a first set of end effector parameters pertaining to said first end effector, and wherein said surgical instrument is configured to ascertain said first set of data and enter a first operating state after ascertaining said first set of stored data; and a second end effector attachable to said surgical instrument, wherein said second end effector comprises a second set of stored data regarding a second set of end effector parameters pertaining to said second end effector, wherein said surgical instrument is configured to ascertain said second set of data and enter a second operating state after ascertaining said second set of stored data, wherein said first set of stored data comprises an instruction to limit the power that said battery can supply to said motor to a first power, and wherein said second set of stored data comprises an instruction to limit the power that said battery can supply to said motor to a second power, characterized in that said surgical instrument is configured to enter a default operating mode if said surgical instrument is unable to ascertain a set of stored data from an attached end effector, and wherein said default operating mode comprises limiting the power that said battery can supply to said motor to a default power.