Shut down at 50% of batery

[Vinamar]

I have samsung tab 3 .when my phones battery is 50% it shut down.i think thatwhen my battery is 0 it shows 50. Plz tell me a solution.

 

[hang-the-9]

I'd replace the battery or at least try to re-seat it. https/www.ifixit.com/Guide/Samsung+Galaxy+Tab+3+7.0+Battery+Replacement/25313