Laptop Battery For Samsung NP-R20 NP-R20F NP-R25 X11WIP5500 X11XEC5500 NP-X1 NP-X11 NT-X1 R20 R20plus R25 R25plus X1 X11 Series P/N's: AA-PB0NC4B/E AA-PB1NC4B/E AA-PBONC4B AA-PL0NC8B AA-PL0NC8B/E