Toshiba Satellite C50 battery doesn't charge when the AC adaptor is attached? Try these:

TOSHIBA SATELLITE C50-ABT2N11 10.8V 4200mAh laptop battery 

Toshiba Satellite C50 battery is completely discharged, it will not begin charging immediately, in these instances you should wait a few minutes before trying again. Ifthe battery still does not charge, you should check that the power outlet the AC adapter is connected to its supplying power - this can be tested by plugging another appliance into it.
Check whether the battery is hot or cold to thetouch - if so, it will not charge properly and should be allowed to reach room temperature before youtry again.
Unplug the AC adapter and remove the battery to make sure its connecting terminals are clean - if necessary wipe them with a soft dry cloth lightly dipped in alcohol.
Connect the AC adapter and replace the battery,taking care to ensure that it is securely seated inthe computer.
Check the DC IN/ Battery indicator - if it does notglow, allow the computer to charge the battery forat least twenty minutes. If the DC IN/ Batteryindicator starts to glow after this period, allow the battery to continue to charge for at least another twenty minutes before turning on the computer.However, if the indicator still does not glow, thebattery may be at the end of its operating life andshould be replaced.