Sebastian Guadarrama-Sistos , Below is a link to show how to open laptop to access battery for changing. 2nd link shows how you can google search to find a replacement battery using your computers make and model #, link 3&4 are guides telling you symptoms of a bad battery. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=XrZYYE1n...

https://www.google.ca/search?q=toshiba+s...

http://www.howtogeek.com/172362/how-to-k...

http://www.dummies.com/computers/pcs/how...