If you own a PSP, you might want to uh, make sure your battery isn't expanding – Destructoid
3.6V 3600mah Rechargeable Battery for Sony PSP-110 PSP-1001 PSP 1000 FAT US - Walmart.com
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Sony PSP Large Capacity External Battery Pack with Cliphook. Extra 3800 mAh capacity
2x Replacement Lithium Battery Pack for SONY PSP 1000 1001 Fat LITHIUM 3.6V 1800MAH High Capacity (2-Pack Rechargeable Batteries Bundle) by Insten - Walmart.com
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Generic 3.6V 3600mAh Battery Pack for Sony PSP 1000, High-performance Lithium rechargeable battery cell, more battery life than original PSP battery pack. By by JEXON - Walmart.com
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Amazon.com: TFSeven 1800mAh Sony PSP Battery Rechargeable Lithium Ion Replacement PSP-110 Battery Compatible for Sony Playstation Lite PSP 1000 1001 1002 Series : Video Games