I purchased this battery to replace a failing OEM battery for a PSP-1001. As some other reviewers have mentioned, the battery did not fit properly in the battery compartment, as it would not allow the battery door to close. After comparing the original battery to the replacement, I noticed that the tabs that hold the battery in place were longer on the replacement than those on the original. After trimming these tabs down, the replacement fit in the battery compartment correctly allowing the battery door to close. The battery I received was mostly charged and did not take log to top off. In testing the battery, I ran a demo that has a mix of game play and video. The screen was set on low brightness. The PSP ran for 5 hours and 5 minutes before shutting off. After recharging the spent battery, I repeated the same test again. This time, the PSP ran for 5 hours and 35 minutes before shutting off. Only time will tell if the battery's Ah capability will hold up after multiple charge cycles. Aside from having to trim the battery to make it fit, I am quite pleased with the performance of this battery.