電池（Battery）指盛有電解質溶液和金屬電極以產生電流的杯、槽或其他容器或復合容器的部分空間，能將化學能轉化成電能的裝置。具有正極、負極之分。隨著科技的進步，電池泛指能產生電能的小型裝置。如太陽能電池。電池的性能參數主要有電動勢、容量、比能量和電阻。利用電池作為能量來源，可以得到具有穩定電壓，穩定電流，長時間穩定供電，受外界影響很小的電流，并且電池結構簡單，攜帶方便，充放電操作簡便易行，不受外界氣候和溫度的影響，性能穩定可靠，在現代社會生活中的各個方面發揮有很大作用。

選(xuan)(xuan)(xuan)購(gou)(gou)(gou)電(dian)(dian)池(chi)(chi)(chi)可(ke)以看(kan)(kan)這(zhe)幾點(dian)： 【1】選(xuan)(xuan)(xuan)購(gou)(gou)(gou)有(you)“國家免檢”、“中(zhong)國名(ming)(ming)牌”標(biao)志的(de)(de)(de)(de)電(dian)(dian)池(chi)(chi)(chi)產(chan)品和(he)地方名(ming)(ming)牌電(dian)(dian)池(chi)(chi)(chi)產(chan)品，這(zhe)些(xie)產(chan)品質(zhi)量有(you)一定(ding)的(de)(de)(de)(de)保(bao)(bao)障。【2】根(gen)(gen)據(ju)用(yong)電(dian)(dian)器具(ju)(ju)的(de)(de)(de)(de)要求，選(xuan)(xuan)(xuan)擇(ze)適(shi)用(yong)的(de)(de)(de)(de)電(dian)(dian)池(chi)(chi)(chi)類型(xing)和(he)規格(ge)尺寸，并(bing)根(gen)(gen)據(ju)用(yong)電(dian)(dian)器具(ju)(ju)耗電(dian)(dian)的(de)(de)(de)(de)大小和(he)特點(dian)，購(gou)(gou)(gou)買(mai)(mai)適(shi)合用(yong)電(dian)(dian)器具(ju)(ju)的(de)(de)(de)(de) 電(dian)(dian)池(chi)(chi)(chi)。 【3】注(zhu)意查看(kan)(kan)電(dian)(dian)池(chi)(chi)(chi)的(de)(de)(de)(de)生(sheng)產(chan)日期(qi)和(he)保(bao)(bao)質(zhi)期(qi)，購(gou)(gou)(gou)買(mai)(mai)近期(qi)生(sheng)產(chan)的(de)(de)(de)(de)電(dian)(dian)池(chi)(chi)(chi)（新電(dian)(dian)池(chi)(chi)(chi)），新電(dian)(dian)池(chi)(chi)(chi)性(xing)能好。 【4】注(zhu)意查看(kan)(kan)電(dian)(dian)池(chi)(chi)(chi)的(de)(de)(de)(de)外觀，應(ying)選(xuan)(xuan)(xuan)購(gou)(gou)(gou)包(bao)裝(zhuang)精致、外觀整(zheng)潔(jie)、干(gan)凈，無(wu)漏液(ye)跡象(xiang)的(de)(de)(de)(de)電(dian)(dian)池(chi)(chi)(chi)。【5】注(zhu)意電(dian)(dian)池(chi)(chi)(chi)的(de)(de)(de)(de)標(biao)志，電(dian)(dian)池(chi)(chi)(chi)商(shang)標(biao)上(shang)應(ying)標(biao)明(ming)生(sheng)產(chan)廠名(ming)(ming)、電(dian)(dian)池(chi)(chi)(chi)極性(xing)、電(dian)(dian)池(chi)(chi)(chi)型(xing)號、標(biao)稱電(dian)(dian)壓、商(shang)標(biao)等(deng)；銷(xiao)售(shou)包(bao)裝(zhuang)上(shang)（如2只(zhi)熱縮(suo)或(huo)4只(zhi)熱縮(suo)，或(huo)吊牌掛卡）應(ying)有(you)中(zhong)文廠址、生(sheng)產(chan)日期(qi)和(he)保(bao)(bao)質(zhi)期(qi)或(huo)標(biao)明(ming)保(bao)(bao)質(zhi)期(qi)的(de)(de)(de)(de)截止期(qi)限、執行標(biao)準的(de)(de)(de)(de)編號。購(gou)(gou)(gou)買(mai)(mai)堿性(xing)鋅錳電(dian)(dian)池(chi)(chi)(chi)時(shi)應(ying)看(kan)(kan)型(xing)號有(you)無(wu)ALKALINE或(huo)LR字樣。 【6】由于(yu)電(dian)(dian)池(chi)(chi)(chi)中(zhong)的(de)(de)(de)(de)汞對環境(jing)(jing)有(you)害，為了保(bao)(bao)護環境(jing)(jing)，在購(gou)(gou)(gou)買(mai)(mai)時(shi)應(ying)選(xuan)(xuan)(xuan)用(yong)商(shang)標(biao)上(shang)標(biao)有(you)“無(wu)汞”、“0%汞”、“不添(tian)加汞”字樣的(de)(de)(de)(de)電(dian)(dian)池(chi)(chi)(chi)。