Hi
This computer has a 1 year warranty on parts, labor and battery.
If you bought it locally I'd take it to the store and explain your problem.
If you bought it online you'll have to contact the seller, or try contacting Toshiba directly.
But don't wait and let the warranty run out.
Does the computer work as long as it's plugged in?
Check the contacts on the battery if you can, and make sure it's making a good connection with the contacts.
Mike