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(zui)(zui)終能(neng)夠釋放(fang)出(chu)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)是(shi)不同的(de)，有(you)一(yi)定的(de)差(cha)距。蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)的(de)容(rong)(rong)量(liang)標(biao)注都(dou)是(shi)有(you)統(tong)一(yi)標(biao)準(zhun)的(de)。目前使用(yong)(yong)最(zui)(zui)多的(de)是(shi)10小時(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)與20小時(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)兩種。10小時(shi)(shi)率(lv)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)量(liang)就是(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)以(yi)(yi)恒定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，至電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)耗盡放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)間能(neng)夠維持10個小時(shi)(shi)左右，這個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流就被稱作10小時(shi)(shi)率(lv)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(衡量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量(liang)用(yong)(yong)盡的(de)標(biao)準(zhun)，不能(neng)以(yi)(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)端電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓降低到零為(wei)準(zhun)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)過度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，會導致(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)容(rong)(rong)量(liang)減少，無法恢復，乃至提(ti)早(zao)損壞、完全(quan)失效。所以(yi)(yi)每(mei)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)終止(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓都(dou)有(you)嚴格(ge)的(de)規定，這個可以(yi)(yi)查閱(yue)相關資料。過度放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)與過度充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)是(shi)造成充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)不能(neng)達到使用(yong)(yong)年限、提(ti)前報廢的(de)主要原因)。實時(shi)(shi)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)測(ce)量(liang)方法最(zui)(zui)大的(de)缺點(dian)就是(shi)費時(shi)(shi)費力(li)，因為(wei)耗時(shi)(shi)久這樣測(ce)量(liang)精(jing)度也很(hen)容(rong)(rong)易受(shou)到各種外部因素(su)的(de)影響(xiang)。

   測量(liang)(liang)過程中(zhong)如果用10小(xiao)時(shi)(shi)率電(dian)(dian)流持續放(fang)電(dian)(dian)時(shi)(shi)間(jian)(jian)至(zhi)少(shao)都要(yao)在5個小(xiao)時(shi)(shi)以(yi)上，作(zuo)這樣長時(shi)(shi)間(jian)(jian)的(de)(de)(de)測試更需要(yao)足夠的(de)(de)(de)耐心與精(jing)(jing)力以(yi)及充裕的(de)(de)(de)時(shi)(shi)間(jian)(jian)。科技的(de)(de)(de)發展是(shi)(shi)非常迅速，今天單(dan)片機已(yi)經非常普(pu)及了。通過單(dan)片機程序控制對放(fang)電(dian)(dian)時(shi)(shi)間(jian)(jian)，深度進行(xing)自動(dong)化控制，就(jiu)很容(rong)(rong)易精(jing)(jing)準測出(chu)電(dian)(dian)池的(de)(de)(de)實(shi)際容(rong)(rong)量(liang)(liang)，實(shi)現整個過程的(de)(de)(de)自動(dong)控制。模擬實(shi)際放(fang)電(dian)(dian)測量(liang)(liang)容(rong)(rong)量(liang)(liang)的(de)(de)(de)方法雖(sui)然對能源(yuan)有(you)一(yi)點浪(lang)費，但是(shi)(shi)對于1A、2A以(yi)下的(de)(de)(de)小(xiao)容(rong)(rong)量(liang)(liang)充電(dian)(dian)電(dian)(dian)池還(huan)是(shi)(shi)完全(quan)可行(xing)的(de)(de)(de)，對大容(rong)(rong)量(liang)(liang)電(dian)(dian)池進行(xing)抽(chou)樣檢查也是(shi)(shi)很有(you)必要(yao)。