Such As Used Batteries

In theory, he says, such devices could maintain their power indefinitely until used, unlike batteries whose charges leak away gradually as they sit unused.

理论上，他说，这种设备应该能够无限期地保持它们的电量，直到它们被使用；不像电池，当它们未被使用时电荷也在渐渐泄漏。

Meanwhile, materials such as lithium (PDF) and cobalt used in the manufacture of batteries for rechargeable vehicles are largely sourced outside the United States.

与此同时，生产电瓶车车用蓄电池所使用的锂和钴等材料又大多从美国境外采购。

First tof all, if the vessels were used as batteries, they would probably have been attached to some electricity conductors such as metal wires.

首先，如果这些土罐以往被用作电池的话，它们就很可能连着一些类似于金属线的电导体。