Why when l charge my Samsung tablet up and the battery do sent move of 17% why can you help

[AC Question]

Well when l go to charge my Samsung tablet up it do sent seem to move the battery from 17% and l wounded why its not letting me charge it up if I can have some help plz.

 

[belodion]

Does it actually charge fully, but indicate only 17%; or do you get so little use out of it that it is obviously charging to no more than 17%?