Why is my Battery life draining?

[AC Question]

I noticed my screen will not shut off on my Samsung Tab English. What do I do to save my battery it says cell standby as use me plrase.

 

[B. Diddy]

Welcome to Android Central! Sorry, do you mean the Galaxy Tab E? What do you mean that the screen won't shut off? It just stays on, even if the tablet has been idle for a while?