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I bought it this week ! I charge it 100% and when i used it and hé become 50% hé shut down Alone ! Plz any help

If I understand this correctly what you are saying is that you charge the tablet to 100% and then it turns off at 50%. This could be for a few reasons, the tablet could be getting too hot, the software could be crashing, battery saver could be turned on and reducing the screen brightness when the tablet hits 50% (so its still on but you cant see), ect. If you could offer some more information it would help.

The cause of this condition is the battery