求翻译：（2）开路电压法。是通过检测开路电压来得到蓄电池的容量大小，原理就是开路电压与蓄电池的剩余容量基本呈线性关系(以镍氢电池为例说明)如100%对应开路电压2.1lV，87%对应开路电压2.09V。在手机上使用这种方法显示电池容量。剩余容量与电池的开路电压的关系如表2-2所示：是什么意思？

(2) open-circuit voltage method. By detecting open circuit voltage to get the size of the battery, the principle is the open circuit voltage and remaining battery capacity is a linear relationship between (Ni-MH battery as an example) 100% corresponds to the open circuit voltage 2.1lv 87% of the cor