In an image forming apparatus, unnecessary light emitted from a light source is irradiated to a solar battery panel in printing or reading an image, and in a standby state. A messaging client device is adapted to receive an impermanent message and to manage the received message in accordance with a message management policy associated with the message. The other end of the core is insertable into a boss extending from a wall of the dispenser. In some implementations, the filter and shell are secured to one another via a valve that passes air between a user and an environment. The solid, gel type non-aqueous electrolyte is preferably incorporated into an electrochemical cell further including a metal anode and an intercalation cathode.