Wǒde shǒujī méi diàn le.

我的手机没电了。

The battery of my mobile phone is dead. 

Notes:

我的(wǒde): my

手机(shǒujī): mobile phone

(méi): have no

(diàn): electricity, battery

(le): particle word

Example:

A:我的手机没电了。你有充电器吗?

     Wǒde shǒujī méi diàn le. Nǐ yǒu chōnɡdiànqì mɑ?

     The battery of my mobile phone is dead.  Do you have a changer?

B:不好意思,没有。

     Sorry, I haven't.

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