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)夠釋放(fang)出的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)是(shi)(shi)(shi)不(bu)同(tong)的(de)(de)，有(you)(you)一定(ding)的(de)(de)差距(ju)。蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)的(de)(de)容(rong)量(liang)(liang)標(biao)注(zhu)都是(shi)(shi)(shi)有(you)(you)統一標(biao)準的(de)(de)。目(mu)前(qian)使(shi)用最多的(de)(de)是(shi)(shi)(shi)10小(xiao)時(shi)(shi)(shi)率(lv)(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)與20小(xiao)時(shi)(shi)(shi)率(lv)(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)兩(liang)種。10小(xiao)時(shi)(shi)(shi)率(lv)(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)就(jiu)(jiu)是(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)以恒定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，至(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)耗盡放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)間能(neng)夠維持10個小(xiao)時(shi)(shi)(shi)左右，這(zhe)(zhe)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就(jiu)(jiu)被稱作10小(xiao)時(shi)(shi)(shi)率(lv)(lv)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(衡量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)用盡的(de)(de)標(biao)準，不(bu)能(neng)以電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)端電(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(chi)(chi)過(guo)度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，會(hui)導(dao)致電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)容(rong)量(liang)(liang)減少(shao)，無(wu)法恢復，乃至(zhi)提早損壞、完全失效。所(suo)以每種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)終止電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都有(you)(you)嚴格的(de)(de)規定(ding)，這(zhe)(zhe)個可(ke)以查閱(yue)相(xiang)關資(zi)料。過(guo)度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)與過(guo)度充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)(shi)(shi)造成(cheng)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)不(bu)能(neng)達到(dao)使(shi)用年限(xian)、提前(qian)報(bao)廢的(de)(de)主要原因(yin))。實時(shi)(shi)(shi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)測(ce)量(liang)(liang)方法最大的(de)(de)缺(que)點就(jiu)(jiu)是(shi)(shi)(shi)費時(shi)(shi)(shi)費力(li)，因(yin)為耗時(shi)(shi)(shi)久這(zhe)(zhe)樣測(ce)量(liang)(liang)精度也很容(rong)易受到(dao)各種外(wai)部因(yin)素的(de)(de)影響。

   測量(liang)過程(cheng)(cheng)中如果用10小(xiao)(xiao)(xiao)時(shi)(shi)率電(dian)流持續放(fang)電(dian)時(shi)(shi)間(jian)至少都(dou)要(yao)在5個小(xiao)(xiao)(xiao)時(shi)(shi)以上，作這樣(yang)長時(shi)(shi)間(jian)的(de)(de)(de)(de)測試更需要(yao)足夠(gou)的(de)(de)(de)(de)耐心(xin)與(yu)精(jing)力以及(ji)充裕(yu)的(de)(de)(de)(de)時(shi)(shi)間(jian)。科技(ji)的(de)(de)(de)(de)發展是非(fei)常迅速，今天單片(pian)機(ji)(ji)已經非(fei)常普(pu)及(ji)了。通(tong)過單片(pian)機(ji)(ji)程(cheng)(cheng)序(xu)控(kong)(kong)制(zhi)對放(fang)電(dian)時(shi)(shi)間(jian)，深(shen)度進行(xing)自動化控(kong)(kong)制(zhi)，就很容易精(jing)準測出電(dian)池(chi)的(de)(de)(de)(de)實(shi)際(ji)容量(liang)，實(shi)現整個過程(cheng)(cheng)的(de)(de)(de)(de)自動控(kong)(kong)制(zhi)。模擬實(shi)際(ji)放(fang)電(dian)測量(liang)容量(liang)的(de)(de)(de)(de)方法雖然對能源有一點(dian)浪費，但是對于(yu)1A、2A以下的(de)(de)(de)(de)小(xiao)(xiao)(xiao)容量(liang)充電(dian)電(dian)池(chi)還是完全可行(xing)的(de)(de)(de)(de)，對大容量(liang)電(dian)池(chi)進行(xing)抽樣(yang)檢(jian)查也是很有必要(yao)。