High performance comes at a high price, that is why the battery life on the Sony PSP is not that long. Depending on usage 3-5 hours continuous gameplay are possible. with Wi-fi on the battery life is getting considerably shorter. IGN has a detailed Sony PSP Battery life test.
This is where products like the PSP Power Brick are coming in. They provide extra power when no AC or DC power supply are available for the Sony PSP.
GameStop sells the PSP Power Brick for $19.99, shipping date is March 16th.
More Sony PSP Deals in our Sony PSP Center.