The battery of my cell phone died.
- 휴대전화 배터리가 떨어졌어.

A : Why didn't you call me?
B : I'm so sorry. The battery of my cell phone died. I forgot to rechange it last night.
A : You should have come early.

A : 왜 전화 받지 않았어?
B : 정말 미안해. 휴대전화 배터리가 떨어졌어. 어제밤에 충전하는 걸 잊어버렸어.
A : 너는 일찍 왔어야 했어.