NOVELTY - Solar battery power supply device comprises: (a) a battery pack that includes rechargeable battery cells connected to each other in series or in parallel; (b) a solar panel that includes solar cells capable of generating electric power for charging the battery pack; (c) a charging operation controlling portion that can control charging current or charging voltage when the battery pack is charged with electric power generated by the solar panel; and (d) a voltage detecting portion that detects battery voltage of the battery pack.    USE - Used as a solar battery power supply device.    ADVANTAGE - The solar battery power supply device includes a combination of solar battery and rechargeable battery and can properly charge the rechargeable battery. It is possible to reliably detect the fully-charged state. It is also possible to eliminate or reduce improper detection of the fully-charged state caused by variation of charging current.    DETAILED DESCRIPTION - Solar battery power supply device comprises: (a) a battery pack that includes rechargeable battery cells connected to each other in series or in parallel; (b) a solar panel that includes solar cells capable of generating electric power for charging the battery pack; (c) a charging operation controlling portion that can control charging current or charging voltage when the battery pack is charged with electric power generated by the solar panel; and (d) a voltage detecting portion that detects battery voltage of the battery pack. The charging operation controlling portion, when the battery pack is brought close to the fully-charged state, cuts off the charging current at predetermined timing for a charging operation stop period, and compares the battery voltage of the battery pack with a predetermined voltage value as a restart voltage value in the charging operation stop period, where the charging operation controlling portion determines that the battery pack is fully charged if the battery voltage of the battery pack is not lower than the predetermined voltage value as the restart voltage value, and cuts off the charging current. An INDEPENDENT CLAIM is included for a rechargeable battery solar charging method for supplying charging current to a battery pack that includes rechargeable battery cells connected to each other in series or in parallel by using electric power generated by a solar panel that includes solar cells.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the solar battery power supply device.    Support pole (402)    Light (404)    Solar panel (410)    Console (460)    Doors (461)    Inverter (462)    Switching circuit (464)