系統設計者只需要根據已經知道的當前電池電壓區間設定好新的電壓檢測閾值，當電池電壓變化到這個閾值的時候，RT9801B 輸出端的狀態就會發生變化，這樣便知道電池電量已經到了新的水平了，隨即改變顯示在屏幕上的圖標狀態即可讓用戶知道當前的電池荷電情況。這種做法對電量的測量很不精確，但是已經可以滿足當時的需要了，所以是可以被接受的，實際上就是到了今天也還有很多設備是這么做的，我最近購買的一臺洗車機就是這樣的電量顯示方式，對我來說覺得已經夠用了。
鋰離子電池的外顯電壓與其實際電量之間的關系并不是完全一一對應的，這與實際的負載情況有很大的關系，但是如果將電池開路電壓、實際電壓與其儲能之間的關系聯系起來做成算法，還是可以比較準確地計算出電池的荷電狀態，只不過由于缺少電流信息，實際的電池電量不能得出，能給出的是電池儲能的相對狀態，而且精度還很高，立锜的第一代電量計產品便是這樣做的，下面的數據可以告訴你它的精度水平：誤差可以做到 ±3% 以下。
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