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(gou)釋放(fang)出的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)是(shi)不同的，有一定(ding)的差距。蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的容(rong)(rong)量(liang)標注(zhu)都是(shi)有統(tong)一標準(zhun)的。目前(qian)使(shi)用(yong)(yong)最多的是(shi)10小時(shi)(shi)(shi)(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)與20小時(shi)(shi)(shi)(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)兩種(zhong)。10小時(shi)(shi)(shi)(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)就(jiu)(jiu)是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)以(yi)恒定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，至(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)耗盡放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)(shi)(shi)間能(neng)(neng)夠(gou)維持10個小時(shi)(shi)(shi)(shi)(shi)左(zuo)右，這(zhe)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就(jiu)(jiu)被(bei)稱作(zuo)10小時(shi)(shi)(shi)(shi)(shi)率(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(yong)(yong)盡的標準(zhun)，不能(neng)(neng)以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓降低到零為準(zhun)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)過度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，會導致電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)容(rong)(rong)量(liang)減少，無法恢復，乃至(zhi)提早損壞、完全失效。所以(yi)每(mei)種(zhong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)終止電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都有嚴格的規定(ding)，這(zhe)個可(ke)以(yi)查閱相關資料。過度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)與過度充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(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)不能(neng)(neng)達到使(shi)用(yong)(yong)年限、提前(qian)報(bao)廢的主要原因)。實時(shi)(shi)(shi)(shi)(shi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的測(ce)量(liang)方(fang)法最大的缺點就(jiu)(jiu)是(shi)費(fei)時(shi)(shi)(shi)(shi)(shi)費(fei)力，因為耗時(shi)(shi)(shi)(shi)(shi)久這(zhe)樣測(ce)量(liang)精度也(ye)很容(rong)(rong)易受到各種(zhong)外部因素的影響。

   測(ce)(ce)(ce)量過(guo)程中如果用10小(xiao)時率電(dian)流持(chi)續(xu)放(fang)電(dian)時間至少都要在5個小(xiao)時以上，作(zuo)這(zhe)樣長時間的(de)測(ce)(ce)(ce)試更(geng)需(xu)要足夠的(de)耐(nai)心(xin)與精力以及(ji)充(chong)裕的(de)時間。科(ke)技的(de)發展是非常(chang)迅速，今天單片(pian)機已經非常(chang)普及(ji)了。通過(guo)單片(pian)機程序(xu)控制對(dui)(dui)放(fang)電(dian)時間，深度進行自動化控制，就(jiu)很容(rong)易精準測(ce)(ce)(ce)出電(dian)池(chi)的(de)實(shi)際容(rong)量，實(shi)現整個過(guo)程的(de)自動控制。模(mo)擬實(shi)際放(fang)電(dian)測(ce)(ce)(ce)量容(rong)量的(de)方法雖然對(dui)(dui)能源(yuan)有一點浪費，但是對(dui)(dui)于1A、2A以下的(de)小(xiao)容(rong)量充(chong)電(dian)電(dian)池(chi)還是完全可行的(de)，對(dui)(dui)大(da)容(rong)量電(dian)池(chi)進行抽樣檢查也是很有必(bi)要。