Suppression malfunction of an authentication circuit for authenticating a battery pack. The improvement resides in the use of a lithium salt of the formula:Li2B12FxZ12-xwherein x greater than or equal to 4 and Z represents H, Cl, and Br. The cutting member is operable to cut tissue clamped between the jaws. Biasing means is fitted between hooks or bosses of the arms, and biases the first and second arms toward the open position.