The PSP's battery is removable for replacement by the end-user. This may be a response to the criticism of the nonremovable batteries in other portable electronics such as the Apple iPod. One is thus able to purchase extra batteries as an accessory; at the Japanese launch, they cost �5,040 including tax (around US$47, �37, �26).

Creatures: including Moogles (an intelligent race who have appeared in every game since Final Fantasy III with the notable exception of Final Fantasy IV), Tonberrys, Cactuars (who have both appeared in every game since Final Fantasy V), and Chocobos (every game since Final Fantasy II).

Numerical analysis is the study of algorithms for the problems of continuous mathematics (as distinguished from discrete mathematics). This means it deals mainly with real variable or complex variable questions, numerical linear algebra over the real or complex fields, the solution of differential equations, and other related problems arising in the physical sciences and engineering.