If you are on the road or in meetings frequently and require non-interrupted computing time, keep an extra battery pack handy and enjoy the true portability of your PC.
Specifications:

Capacity: 10.8V x 51Wh
Numbre of battery cells: 6
Dimensions: 4.9" x 2.7" x 0.8"
Weight: 0.7 lb
Battery life: Up to 4.5 hours* (Normal Mode)
Battery Saver (in Windows XP): Stand by, HDD Auto Off, Display Auto Off, Throttling, Hibernation
Compatible with Toshiba Satellite R10, R15, R20, R25 series; Satellite Pro 6000, 6100 series ; Portégé M200, M205, M400, M405, M700, M750 and M780 series; Tecra TE2000, TE 2100, M4, M7 series portable computers

M400 M400-EZ5031 M400-ST4001 M400-ST4035 M400-ST9113 M400-S4031 M400-S4032 M400-S4033 M400-S4034 M400-S4035 M400-S5032 M400-S5032X M400-S933 M700 M700-S7001X M700-S7002 M700-S7003V M700-S7003X M700-S7004V M700-S7004X M700-S7005V M700-S7005X M700-S7008 M700-S7008X M700-S7043V M700-S7043X M700-S7044V M700-S7044X M750-ST7258 M750-S7201 M750-S7202 M750-S7211 M750-S7212 M750-S7213 M750-S7221 M750-S7222 M750-S7223 M750-S7241 M750-S7242 M750-S7243 M780-ST7200 M780-ST7201 M780-ST7202 M780-S7210 M780-S7211 M780-S7214 M780-S7220 M780-S7221 M780-S7224 M780-S7230 M780-S7231 M780-S7234 M780-S7240 M780-S7241 M780-S7244 M4-ST1112 M4-S115TD M4-S315 M4-S335 M4-S415 M4-S435