I have a Toshiba A356-S69253 and the battery after a long charge reads 7 - 13 % Charge. On rare occasion I see 97% but within a minute or two the computer shuts down. When I restart the charge is down to 3%. I am having uncontrolled shut down and other problem and suspect a battery problem

The Battery is built in. Can I change the battery? How much is a battery? Can someone else change the battery? How much $? The laptop is pretty old, is it worth trying to fix?

buschwa@aol.com 7/2/2017