用萬用表判斷電瓶好壞，可(ke)通過電壓法(fa)、電流法(fa)、內(nei)阻法(fa)、容(rong)量法(fa)等(deng)多種方式進行初步判斷。

在實際操作(zuo)中(zhong)，電(dian)(dian)(dian)(dian)(dian)壓法是較(jiao)為(wei)常(chang)用的一種。需先將(jiang)(jiang)萬用表(biao)(biao)(biao)(biao)精準地(di)調(diao)到直流電(dian)(dian)(dian)(dian)(dian)壓檔(dang)，20V或(huo)15V量(liang)程(cheng)較(jiao)為(wei)適宜，正(zheng)(zheng)表(biao)(biao)(biao)(biao)筆(bi)(bi)與電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)正(zheng)(zheng)極(ji)(ji)(ji)相(xiang)連，負(fu)表(biao)(biao)(biao)(biao)筆(bi)(bi)連接負(fu)極(ji)(ji)(ji)。測量(liang)12V電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)時，正(zheng)(zheng)常(chang)電(dian)(dian)(dian)(dian)(dian)壓應穩定(ding)在11.5 - 12.5V區間(jian)(jian)，低于(yu)該范圍(wei)(wei)電(dian)(dian)(dian)(dian)(dian)瓶(ping)可(ke)能(neng)(neng)有(you)問題(ti)。電(dian)(dian)(dian)(dian)(dian)流法操作(zuo)相(xiang)對(dui)復雜，要將(jiang)(jiang)萬用表(biao)(biao)(biao)(biao)調(diao)整到電(dian)(dian)(dian)(dian)(dian)流檔(dang)，如(ru)10A或(huo)20A ，串聯在電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組中(zhong)，正(zheng)(zheng)表(biao)(biao)(biao)(biao)筆(bi)(bi)接正(zheng)(zheng)極(ji)(ji)(ji)，負(fu)表(biao)(biao)(biao)(biao)筆(bi)(bi)接負(fu)極(ji)(ji)(ji)，在充電(dian)(dian)(dian)(dian)(dian)或(huo)放電(dian)(dian)(dian)(dian)(dian)時觀察電(dian)(dian)(dian)(dian)(dian)流數值(zhi)，若超(chao)過正(zheng)(zheng)常(chang)范圍(wei)(wei)，表(biao)(biao)(biao)(biao)明(ming)電(dian)(dian)(dian)(dian)(dian)瓶(ping)或(huo)許有(you)故障。內(nei)阻法需把萬用表(biao)(biao)(biao)(biao)置(zhi)于(yu)歐(ou)姆檔(dang)，如(ru)200Ω或(huo)1KΩ，正(zheng)(zheng)表(biao)(biao)(biao)(biao)筆(bi)(bi)接觸(chu)正(zheng)(zheng)極(ji)(ji)(ji)，負(fu)表(biao)(biao)(biao)(biao)筆(bi)(bi)接觸(chu)負(fu)極(ji)(ji)(ji)，12V電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)正(zheng)(zheng)常(chang)電(dian)(dian)(dian)(dian)(dian)阻在0.5 - 1.0Ω之間(jian)(jian)，高于(yu)此范圍(wei)(wei)意味著電(dian)(dian)(dian)(dian)(dian)瓶(ping)內(nei)阻偏大，性能(neng)(neng)可(ke)能(neng)(neng)下(xia)降。容(rong)量(liang)法主(zhu)要針對(dui)免維護鉛酸蓄電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)，將(jiang)(jiang)萬用表(biao)(biao)(biao)(biao)調(diao)至電(dian)(dian)(dian)(dian)(dian)容(rong)檔(dang)，正(zheng)(zheng)表(biao)(biao)(biao)(biao)筆(bi)(bi)接正(zheng)(zheng)極(ji)(ji)(ji)，負(fu)表(biao)(biao)(biao)(biao)筆(bi)(bi)接負(fu)極(ji)(ji)(ji)，12V電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)正(zheng)(zheng)常(chang)電(dian)(dian)(dian)(dian)(dian)容(rong)值(zhi)處于(yu)100 - 220μF之間(jian)(jian)，低于(yu)此范圍(wei)(wei)電(dian)(dian)(dian)(dian)(dian)瓶(ping)容(rong)量(liang)可(ke)能(neng)(neng)不足。

這(zhe)些方法僅(jin)僅(jin)是(shi)初步的(de)檢測(ce)(ce)手段。若測(ce)(ce)量過程中出現異常(chang)情況，或是(shi)對測(ce)(ce)量結果存在疑慮(lv)，最好將(jiang)電瓶交由專業(ye)人(ren)士(shi)進行全面檢查，以確保(bao)判(pan)斷的(de)準確性。