A film covered battery has a battery element, a casing for sealing the
battery element, and lead terminals connected to a positive electrode and
a negative electrode, respectively, of the battery element, and extending
from the casing. The casing is flexible, and is comprised of two halves
for sealably sandwiching the battery element on both sides in the
thickness direction thereof. One of the halves of the casing, sandwiching
the battery element, is formed with a recess for receiving the battery
element. The lead terminals are each connected to the battery element at
a position inside of both surfaces of the battery element in the
thickness direction.