On mine, the plus side goes toward the camera, which I guess you would call plus side in. The battery, which I obtained from a local camera dealer, is apparently made in China. The package is marked S400PX BP. It appears to be used as a replacement for E400N, RM400R, and V400PX. On the battery itself, it is marked S936S VINNIC Silvercell. I paid $3.80 for this one in July 2005.