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(zhong)能(neng)夠釋放(fang)(fang)(fang)出的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)是(shi)(shi)不(bu)(bu)同的(de)(de)，有(you)一定的(de)(de)差距。蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)(de)容(rong)(rong)量(liang)標注都是(shi)(shi)有(you)統一標準的(de)(de)。目前使用最多的(de)(de)是(shi)(shi)10小時(shi)(shi)率(lv)(lv)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)與20小時(shi)(shi)率(lv)(lv)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)兩種。10小時(shi)(shi)率(lv)(lv)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)就(jiu)(jiu)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)以(yi)恒(heng)定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，至(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)耗(hao)盡放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)間能(neng)夠維持(chi)10個小時(shi)(shi)左右(you)，這(zhe)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就(jiu)(jiu)被稱作10小時(shi)(shi)率(lv)(lv)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(衡量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)用盡的(de)(de)標準，不(bu)(bu)能(neng)以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓降(jiang)低到零(ling)為準。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)過(guo)度放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，會(hui)導致電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)容(rong)(rong)量(liang)減少(shao)，無法恢復，乃至(zhi)提早(zao)損壞、完全(quan)失效(xiao)。所以(yi)每種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)終(zhong)止電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都有(you)嚴格的(de)(de)規定，這(zhe)個可(ke)以(yi)查閱(yue)相(xiang)關資(zi)料。過(guo)度放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)與過(guo)度充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)(shi)造成充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)不(bu)(bu)能(neng)達到使用年限、提前報廢的(de)(de)主要原因)。實時(shi)(shi)放(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)測(ce)量(liang)方法最大的(de)(de)缺點就(jiu)(jiu)是(shi)(shi)費(fei)時(shi)(shi)費(fei)力，因為耗(hao)時(shi)(shi)久這(zhe)樣測(ce)量(liang)精度也(ye)很容(rong)(rong)易(yi)受(shou)到各種外部因素的(de)(de)影響。

   測量(liang)過程中如果(guo)用10小時率電(dian)流持(chi)續放(fang)(fang)(fang)電(dian)時間(jian)至少都要(yao)在(zai)5個小時以上，作(zuo)這樣(yang)長時間(jian)的(de)(de)測試(shi)更需要(yao)足夠(gou)的(de)(de)耐(nai)心與(yu)精力以及(ji)充裕(yu)的(de)(de)時間(jian)。科技的(de)(de)發(fa)展(zhan)是(shi)非(fei)常迅速，今天(tian)單片(pian)機已經非(fei)常普及(ji)了。通過單片(pian)機程序控制對(dui)放(fang)(fang)(fang)電(dian)時間(jian)，深度(du)進行(xing)自(zi)動化(hua)控制，就很容易精準(zhun)測出電(dian)池的(de)(de)實際容量(liang)，實現整個過程的(de)(de)自(zi)動控制。模擬實際放(fang)(fang)(fang)電(dian)測量(liang)容量(liang)的(de)(de)方(fang)法(fa)雖(sui)然對(dui)能源有一(yi)點浪費，但是(shi)對(dui)于1A、2A以下的(de)(de)小容量(liang)充電(dian)電(dian)池還(huan)是(shi)完(wan)全可行(xing)的(de)(de)，對(dui)大容量(liang)電(dian)池進行(xing)抽樣(yang)檢查也是(shi)很有必要(yao)。