If you've lost your PSP wall charger, you may be worrying about how you'll keep your PSP charged until you can get a replacement. Fortunately, there's more than one way to charge a PSP. If you have a Mini-B USB cable--the kind used by most digital cameras--you can charge your PSP by connecting it to your PlayStation 3 (PS3) or computer.
Select the "System Settings" sub-menu from the "Settings" menu on the PSP's XMB dashboard.
Find and highlight the "USB charge" option and press X. Select "On" to enable USB charging.
Connect the PSP to your PS3 or computer with the USB cable. Put the PSP into USB mode by selecting "USB Settings" from the "Settings" menu. When the Power indicator turns orange, the PSP is charging.