This is the first of three units that I ordered to arrive.
The battery lasted around an hour in my GBA SP; I am disappointed with the quality of the battery. It should be noted that the battery didn't arrive in official, sealed, packaging, it was in a plastic bag that could have been a repackaged with a sticker to "seal" the bag.
I am wondering if what I received was a returned unit that was repackaged. I will test the next two batteries that I ordered from this seller when they arrive.