電池容量是衡量電池質量的重要指標。充電電池的容量測試有很多的方法。可以依據電池的放電曲線，進行短時間放電，從而粗略得出電池容量。這種方法最大的優點是快速，但是充電電池的放電曲線并不具有普遍性，很多劣質電池放電初期電壓也很平穩，一旦進入中后期，電壓下降非常迅速，所以采用這種方法得出的結論將非常不準確的。最可靠最準確無誤的還是以標準電流放電，全程測量實際放電時間的方式。
   不同的放電電流，充電電池最終能(neng)(neng)夠釋放(fang)(fang)出的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)是(shi)(shi)不(bu)同的(de)(de)(de)(de)，有(you)一定的(de)(de)(de)(de)差距。蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)(de)(de)容(rong)量(liang)(liang)標注都是(shi)(shi)有(you)統一標準的(de)(de)(de)(de)。目前(qian)使(shi)(shi)用(yong)最多的(de)(de)(de)(de)是(shi)(shi)10小時(shi)(shi)(shi)(shi)率放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)與20小時(shi)(shi)(shi)(shi)率放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)兩(liang)種。10小時(shi)(shi)(shi)(shi)率放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)就(jiu)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池以(yi)恒(heng)定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，至電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)耗盡放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)(shi)間能(neng)(neng)夠維持10個小時(shi)(shi)(shi)(shi)左右，這(zhe)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流就(jiu)被稱(cheng)作10小時(shi)(shi)(shi)(shi)率電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(衡量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)用(yong)盡的(de)(de)(de)(de)標準，不(bu)能(neng)(neng)以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)端(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓降低到(dao)零(ling)為準。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池過度(du)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，會(hui)導致電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池容(rong)量(liang)(liang)減少，無法恢復，乃至提早損壞、完全(quan)失效。所以(yi)每(mei)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)終止電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都有(you)嚴格的(de)(de)(de)(de)規定，這(zhe)個可以(yi)查(cha)閱相關資(zi)料。過度(du)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)與過度(du)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)(shi)造成充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池不(bu)能(neng)(neng)達到(dao)使(shi)(shi)用(yong)年限、提前(qian)報廢(fei)的(de)(de)(de)(de)主要原因)。實時(shi)(shi)(shi)(shi)放(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)測(ce)量(liang)(liang)方法最大的(de)(de)(de)(de)缺點(dian)就(jiu)是(shi)(shi)費時(shi)(shi)(shi)(shi)費力，因為耗時(shi)(shi)(shi)(shi)久這(zhe)樣測(ce)量(liang)(liang)精度(du)也很容(rong)易受到(dao)各(ge)種外部因素的(de)(de)(de)(de)影響。

   測(ce)量(liang)(liang)過(guo)(guo)程(cheng)中如果用10小(xiao)時率(lv)電(dian)(dian)(dian)流持續放電(dian)(dian)(dian)時間(jian)(jian)至少都(dou)要在5個(ge)小(xiao)時以(yi)(yi)上，作這樣(yang)(yang)長(chang)時間(jian)(jian)的(de)測(ce)試更(geng)需要足夠(gou)的(de)耐心與精力以(yi)(yi)及(ji)充裕的(de)時間(jian)(jian)。科技的(de)發展是(shi)非(fei)常迅速，今天單片機已經非(fei)常普及(ji)了。通過(guo)(guo)單片機程(cheng)序控制(zhi)對(dui)放電(dian)(dian)(dian)時間(jian)(jian)，深度進行(xing)自動(dong)化(hua)控制(zhi)，就很容(rong)(rong)易精準測(ce)出電(dian)(dian)(dian)池(chi)的(de)實際容(rong)(rong)量(liang)(liang)，實現整個(ge)過(guo)(guo)程(cheng)的(de)自動(dong)控制(zhi)。模擬實際放電(dian)(dian)(dian)測(ce)量(liang)(liang)容(rong)(rong)量(liang)(liang)的(de)方法(fa)雖(sui)然對(dui)能源有一點浪費，但是(shi)對(dui)于(yu)1A、2A以(yi)(yi)下的(de)小(xiao)容(rong)(rong)量(liang)(liang)充電(dian)(dian)(dian)電(dian)(dian)(dian)池(chi)還是(shi)完全(quan)可行(xing)的(de)，對(dui)大(da)容(rong)(rong)量(liang)(liang)電(dian)(dian)(dian)池(chi)進行(xing)抽樣(yang)(yang)檢查也是(shi)很有必要。