A lithium secondary battery comprising a case, an internal electrode body
inside the case, electrolyte contained in the case, and an insulator
between the case and a terminal. Also, a lithium secondary battery
comprising a body member, electrolyte contained in the body member, an
internal electrode body inside the body member, an and cap and an
insulator between the body member and the end cap. In each battery, the
internal electrode body comprises a positive electrode, a negative
electrode and a separator between the electrodes, being electrically
insulated from each other. In each battery, a first terminal is
electrically connected to the negative electrode, and a second terminal is
electrically connected to the positive electrode. The insulator comprises
ethylene-propylene rubber, has surface hardness of from 30 (durometer A)
to 60 (durometer D), and has volume resistivity of at least 10.sup.10
.OMEGA.-cm.
