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The PSP-1000 is an external battery that is moulded to fit perfect along the bottom of the Sony PSP so it virtually becomes part of the machine. With the PSP-1000 the total battery capacity available to the PSP is effectively doubled* as it combines with the internal battery giving the PSP double* the run time without changing or charging batteries as would be the case with the internal battery only.
*(assuming original battery is 1500mAh)
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