Always bring a portable battery, which will come in handy if anyone's cell phone runs out of juice.

要一直带个便携式电池，如果有人手机没电了，它就能派上用场。

I've also packed portable batteries for our devices in case we run out of power en route.

玛莎：我还为我们的设备准备了便携式电池，以防我们在途中没电。

They charge using a unique magnetic USB cable, which can also be used with a portable battery pack.

它们使用独特的磁性 USB 数据线充电，也可与便携式电池组一起使用。