Li-ion High Capacity Battery Pk 12-CELL for Toshiba A3 A4 S2 M45 THIS TOSHIBA PA3400U-1BRS IS SPECIFICALLY DESIGNED AND TESTED TO MEET THE POWER NEEDS OF YOUR TOSHIBA LAPTOP. IF YOU ARE ON THE ROAD, IN LENGTHY MEETINGS, OR ON AN EXTENDED FLIGHT AND REQUIRE NON-INTERRUPTED COMPUTING TIME, KEEP AN EXTRA BATTERY PACK HANDY AND ENJOY THE TRUE PORTABILITY OF Works with the following models: Toshiba A100-S8111TD, Toshiba A100-ST8211, Toshiba A105-S4001 Toshiba A105-S4002, Toshiba A105-S4004, Toshiba A105-S4011, Toshiba A105-S4012