Bought for a galaxy S3 4G base which the same battery as the GS3 3G, Samsung original battery made in Korea, autonomy is beautiful is not a smartphone but almost as old phones who consumed very little. The new Samsung battery cover is thick and strong so do not require additional cache (which also is not nearly that size). The phone has a better grip for me as a man with large hands because it is coarser. For about 30 is fantastic change, better to change to a Galaxy S4, I think ...