A system and method for automatically removing polarized light in an environment having polarized light and unpolarized light. The system efficiently allocates ISDN bandwidth on demand by a subscriber. The solvent contains 10 volume % or more of \u03b3-butyrolactone with respect to the total solvent, and the positive electrode active material contains a Group IVA element and a Group IIA element of the periodic table. The solar cell charging circuit can include a switch that is controlled by the controller. Ink optionally can be deposited on either side of the outer substrate, and the exterior surface of the outer substrate can further include a lacquer.