最初面世的電池電量計是以庫侖計量法為基礎的，采用這樣的計量方法有著很堅實的理論依據，因為對電流積分便可得到電量是個很基礎的物理常識，順著這個思路得到產品也就很正常了，只是這樣的操作存在一個問題，你得知道積分的零點在哪里，也需要知道積分的滿點在哪里，這樣才能得到準確的計量，知道每個時刻點的電池儲能狀態在其整個容量當中所占的比例即荷電狀態（SoC，State ofCharge）。由于知道庫侖計量法的原理，我在很多年前開始使用第一臺智能手機的時候就會經常去做一個動作，把電池電量用盡關機以后再給它充電到滿電，目的就是告訴它零點是什么，滿點又是什么，否則就會常常出現可能顯示還有 10% 電量時就突然關機了的問題。
顯示電量還有 10% 就突然關機，其中涉及的實際情況是電池實際電量已經支撐不住它的外顯電壓了，系統因為電池電壓太低而主動關機，而這時候它所使用的電量計所報告的電量還能支撐它工作很久，于是兩者之間就發生了矛盾，最終取勝的當然是物理限制本身，可以任意被人支配的數據在這時候是一點也沒有意義的。這樣的狀況如果是發生在一臺設計良好的系統里，它便能從斷電關機這一事實得到電池電量實際零點的位置，為它的下一個計量周期做好最充分的準備，使下一次的計量更準確一點，而這也就是我主動讓手機工作到主動關機為止的理論依據。
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