纽扣电池（button cell ）也称扣式电池，是指外形尺寸象一颗小纽扣的电池，一般来说直径较大，厚度较薄（相对于柱状电池如市场上的5号AA等电池）.纽扣电池是从外形上来对电池来分，同等对应的电池分类有柱状电池，方形电池，异形电池。
把钟里放电池的隔间打开，把纽扣电池拿走。
Open the battery compartment of the clock and remove the button battery. In the compartment, notice that there are two connections.
采用金属铝片和金属锂片组装纽扣电池。
Aluminum plate and lithium plate were combined to make button cells.
一个纽扣电池是小型的圆形的电池，总高度小于其直径。
A button cell battery is a round small cell or battery where the overall height is less than the diameter.
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