PlayStation Knowledge Center: PSP
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Before using the PSP® (PlayStation® Portable) system for the first time, the battery pack must be fully charged.
NOTE: Do not plug the AC power cord into the electrical outlet until you have made all other connections.
NOTE: If the PSP® is left unused after the battery pack has been removed, the date and time settings might be reset. If this occurs, the date and time setting screen will be displayed the next time the PSP® is turned on.