The conversation between human and AI assistant.
[|Human|] Edit the following sentence to correct any grammar mistakes and make it more concise: 

"The phone has a not charging issue because it ran out of battery."
[|AI|] "The phone isn't charging because its battery is drained."
[|Human|] 
Edit the following sentence to correct any grammar mistakes and make it more concise: 

"The phone has a not charging issue because it ran out of battery."