This PA5185U 1BRS battery is compatible with the Toshiba Satellite family of laptops that have -A or -B following the model numbers C50, C55 and C55D (for example Satellite C50A). If your laptop model does not have a -A or -B, this battery will not be compatible. Replaces these Toshiba PA5185U-1BRS battery part numbers: PA5184U-1BRS PA5195U-1BRS PA5185U-1BRS PA5186U-1BRS Compatible with these Toshiba laptop models: Satellite C55-B Series Satellite S50D-B Series Satellite S50Dt-B Series Satellite S50t-B Series Satellite 55-B Series Satellite C50-B Series Satellite C50D-B Series Satellite C50Dt-B Series Satellite C55D-B Series Satellite L50-B Satellite L50-B Series Satellite L50-B-182 Satellite L50D-B Series Satellite L50Dt-B Series Satellite L50t-B Series Satellite L55-B Series Satellite L55D-B Series Satellite L55Dt-B Series Satellite L55t-B Series Satellite Pro C50-B Series Satellite Pro C50D-B Series Satellite Pro C50Dt-B Series Satellite Pro C55-B Series Satellite Pro C55D-B Series Satellite Pro L50-B Series Satellite Pro L50D-B Series Satellite Pro L50Dt-B Series Satellite Pro L50t-B Series Satellite Pro L55-B Series Satellite Pro L55D-B Series Satellite Pro L55Dt-B Series Satellite Pro L55t-B Series Satellite Pro R50-B-01R Satellite Pro R50-B-01T Satellite Pro R50-C-008 Satellite Pro R50-C-008-1 Satellite Pro R50-C-00C Satellite Pro S50-B Series Satellite Pro S50D-B Series Satellite Pro S50Dt-B Series Satellite Pro S50t-B Series Satellite Pro S55-B Series Satellite Pro S55D-B Series Satellite Pro S55Dt-B Series Satellite Pro S55t-B Series Satellite S50-B Series Satellite S55-B5258 Satellite S55D-B Series Satellite S55Dt-B Series Satellite S55t-B Series What's in the box 1 x Battery