This battery kit was originally announced back in November of 2007. The PSP Extended Life Battery Kit promised to give you about 20 percent more battery life for $45. Then, it seemed that Sony pulled the thing in 2008.
Anyhow, now it’s back. You can find the PlayStation Portable Extended Life Battery Kit back on Sony’s website for $44.99. Looks like they are Backordered at the moment, but you can always get in line. You can always use more battery life.