The invention especially relates to a removable hand tool battery unit (10) comprising a coupling unit (12, 50) for charging the same.

本发明尤其涉及可更换的手持式工具机蓄电池单元（10），它具 有一个用于使该蓄电池单元充电的耦合单元（12，50）。

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From parts above we can know battery we usually buy is battery unit which can be series or parallel connected in several sets. Battery volume increases with the capacity.

通过这三个参数可以知道，我们购买的电池其实是一个电池组，由许多单节的电池通过并联和串联得到的电池组，通常电压越高容量越大的电池体积也越大。

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While each box contains a beacon, the unit only has enough battery power to transmit a signal for 30 days.

虽然每个盒子里都有一个信标，但这个装置的电池只能够传输30天信号。

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The battery unit sustained severe fire damage, the safety board said, adding that it had sent two additional investigators to Boston.

CNN: Airline: Dreamliner fuel leak due to an open valve

Boeing said the fire was traced to a battery unit that helps to power electrical systems when the engines are idle -- typically while a plane is being serviced or cleaned.

CNN: A week Boeing would like to forget

Boeing said in a statement that the fire was traced to a battery unit that helps power electrical systems when the engines are idle -- typically while a plane is being serviced or cleaned.

CNN: Airline: Dreamliner fuel leak due to an open valve