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Genuine Sony PSP Slim PSP-S110 Battery for PSP 2000 3000 – Resurgence Games
If you own a PSP, you might want to uh, make sure your battery isn't expanding – Destructoid
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3.6V 3600mah Rechargeable Battery for Sony PSP-110 PSP-1001 PSP 1000 FAT US - Walmart.com
New OEM Original Sony PSP Replacement Battery PSP-110 PSP-1000 PSP-1001 1800mAh | eBay