Hello my name is***** will be happy to answer your question. First if you want to you can get a larger battery for your machine and you can also try and keep your screen to a lower brightness so you are not using a lot of power to run the machine. What is the model number of this machine?
Here is a link for a twelve cell battery, http://www.ebay.com/itm/12CELL-8800mAh-Battery-Pack-Model-No-PA5109U-1BRS-Toshiba-LAPTOP-C50-A-C50D-A-/381117412765?hash=item58bc5e359d:g:Rq8AAOSw2s1Ur6nJ
Just upgrade the battery for a longer life keep in mind it will take longer for it to charge but it would last longer and just remember keep the monitor brightness down and you will have a lot longer of a battery life.
That is correct greater charge longer life.
Do you have any other questions for me today? Also if you want to find a battery more local just go to ebay type in the search Toshiba c50-a 12 cell battery you should be able to have a list of batteries just make sure it's 12 cell. If you don't have any further questions please don't forget to leave positive feedback using the rating system it's how we are compensated for our time and information. Please have a good day.