用萬用表檢測12V電瓶(ping)好(hao)壞(huai)，需依次(ci)測量其(qi)電壓(ya)、內阻(zu)和電流，并依據數值判斷狀況。

測(ce)(ce)量電(dian)(dian)(dian)壓(ya)時，將萬(wan)用(yong)(yong)表(biao)調至電(dian)(dian)(dian)壓(ya)測(ce)(ce)試(shi)檔(dang)，用(yong)(yong)測(ce)(ce)試(shi)筆分別連接(jie)電(dian)(dian)(dian)瓶正(zheng)(zheng)負極。正(zheng)(zheng)常(chang)情況下，12V電(dian)(dian)(dian)瓶電(dian)(dian)(dian)壓(ya)處于(yu)12.6V到12.8V之(zhi)間(jian)，若低(di)于(yu)12V，說(shuo)明(ming)(ming)電(dian)(dian)(dian)瓶或許已損壞或正(zheng)(zheng)處于(yu)放電(dian)(dian)(dian)狀(zhuang)態。接(jie)著測(ce)(ce)量內(nei)阻(zu)(zu)，把萬(wan)用(yong)(yong)表(biao)切換至電(dian)(dian)(dian)阻(zu)(zu)測(ce)(ce)量檔(dang)位，正(zheng)(zheng)常(chang)12V電(dian)(dian)(dian)瓶內(nei)阻(zu)(zu)在0.02歐(ou)姆到0.06歐(ou)姆之(zhi)間(jian)，內(nei)阻(zu)(zu)過高表(biao)明(ming)(ming)電(dian)(dian)(dian)瓶存在問題。最后測(ce)(ce)量電(dian)(dian)(dian)流(liu)，將萬(wan)用(yong)(yong)表(biao)調至電(dian)(dian)(dian)流(liu)測(ce)(ce)量檔(dang)位，在無負載(zai)狀(zhuang)態下，電(dian)(dian)(dian)流(liu)值理論上應(ying)為0，若電(dian)(dian)(dian)流(liu)值過大，則說(shuo)明(ming)(ming)電(dian)(dian)(dian)瓶有(you)問題。

在使用(yong)萬用(yong)表檢(jian)測(ce)(ce)(ce)12V電瓶(ping)時，要采用(yong)正(zheng)確的測(ce)(ce)(ce)量(liang)檔位和測(ce)(ce)(ce)試筆連接方式。測(ce)(ce)(ce)量(liang)前需斷開電瓶(ping)與其他設備(bei)的連接，以保障操作安(an)全。要是不(bu)確定(ding)如何(he)測(ce)(ce)(ce)量(liang)，可參(can)考(kao)萬用(yong)表使用(yong)說明或(huo)向專(zhuan)業人士尋求幫助，如此便能較為準確地檢(jian)測(ce)(ce)(ce)出電瓶(ping)的好壞 。