out of juice可不是没果汁了，而是power延伸用法，即没电了。

【例句】
My phone was on the whole time. It's out of juice.
我的手机一直开着没电了。

I hope that conversation to have lasted a bit longer, unfortunately, my cell phone was running out of juice.
我希望那个电话通得时间再长点，不幸的是，我的手机没电了。