This brand new AlienWare 15 R1 R2 Battery replaces battery numbers: 2F3W1 191YN and 410GJ. This is the correct battery if you have a 15" screen (measured diagonally) and you have the R1 or R2 models.
NOTE: This battery is not the correct battery for the M15x R1 or R2 models (revision 1 or 2). This is an internal or integrated battery and you will need to unscrew the back case in order to install the new battery. A small Phillips head screwdriver is all you will need to open up the case. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This laptop battery replacement is 100% compatible with the original battery specifications and is individually tested and backed by a 1 year warranty.