A charge storage device comprising: a first electrode; a second electrode
being opposed to and spaced apart from the first electrode; a porous
separator disposed between the electrodes; a sealed package for
containing the electrodes, the separator and an electrolyte in which the
electrodes are immersed; and a first terminal and a second terminal being
electrically connected to the first electrode and the second electrode
respectively and both extending from the package to allow external
electrical connect to the respective electrodes, wherein the gravimetric
FOM of the device is greater than about 2.1 Watts/gram. Also described is
a method of manufacturing a charge storage device, the method comprising
the steps of: providing a first electrode; disposing a second electrode
in opposition to and spaced apart from the first electrode; disposing a
porous separator between the electrodes; containing within a sealed
package the electrodes, the separator and an electrolyte, wherein the
electrodes are immersed in the electrolyte; and electrically connecting a
first terminal and a second terminal to the first electrode and the
second electrode respectively such that the terminals extending from the
package to allow external electrical connection to the respective
electrodes, wherein the gravimetric FOM of the device is greater than
about 2.1 Watts/gram.