Sony Playstation 3 CECH-2003B - Manual (Page 42)

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Restoring the PS3™ system
This product contains a battery which is permanently built-in for safety,
performance or data integrity reasons. The battery should not need to be
replaced during the lifetime of the product and should only be removed by skilled
service personnel. To ensure the correct waste treatment of the battery, please
dispose of this product as electrical waste.