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)購(gou)(gou)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)可以看這幾點： 【1】選(xuan)購(gou)(gou)有“國家免(mian)檢”、“中(zhong)國名(ming)牌”標(biao)(biao)(biao)(biao)志(zhi)的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)產(chan)品(pin)(pin)和(he)地方名(ming)牌電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)產(chan)品(pin)(pin)，這些(xie)產(chan)品(pin)(pin)質量(liang)有一定的(de)(de)保(bao)障。【2】根據用(yong)(yong)電(dian)(dian)(dian)器具(ju)(ju)的(de)(de)要求，選(xuan)擇適(shi)用(yong)(yong)的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)類型(xing)和(he)規格尺(chi)寸(cun)，并根據用(yong)(yong)電(dian)(dian)(dian)器具(ju)(ju)耗電(dian)(dian)(dian)的(de)(de)大小和(he)特點，購(gou)(gou)買適(shi)合用(yong)(yong)電(dian)(dian)(dian)器具(ju)(ju)的(de)(de) 電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)。 【3】注意查(cha)看電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)的(de)(de)生產(chan)日期(qi)(qi)和(he)保(bao)質期(qi)(qi)，購(gou)(gou)買近期(qi)(qi)生產(chan)的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)（新電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)），新電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)性能好。 【4】注意查(cha)看電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)的(de)(de)外觀(guan)，應(ying)選(xuan)購(gou)(gou)包(bao)裝(zhuang)精致(zhi)、外觀(guan)整潔(jie)、干凈(jing)，無(wu)漏液跡象的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)。【5】注意電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)的(de)(de)標(biao)(biao)(biao)(biao)志(zhi)，電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)商標(biao)(biao)(biao)(biao)上(shang)應(ying)標(biao)(biao)(biao)(biao)明(ming)生產(chan)廠(chang)名(ming)、電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)極性、電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)型(xing)號(hao)(hao)、標(biao)(biao)(biao)(biao)稱電(dian)(dian)(dian)壓、商標(biao)(biao)(biao)(biao)等；銷(xiao)售包(bao)裝(zhuang)上(shang)（如2只熱縮或(huo)4只熱縮，或(huo)吊牌掛卡）應(ying)有中(zhong)文廠(chang)址(zhi)、生產(chan)日期(qi)(qi)和(he)保(bao)質期(qi)(qi)或(huo)標(biao)(biao)(biao)(biao)明(ming)保(bao)質期(qi)(qi)的(de)(de)截止(zhi)期(qi)(qi)限、執行標(biao)(biao)(biao)(biao)準的(de)(de)編號(hao)(hao)。購(gou)(gou)買堿性鋅錳電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)時(shi)應(ying)看型(xing)號(hao)(hao)有無(wu)ALKALINE或(huo)LR字(zi)樣(yang)。 【6】由(you)于電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)中(zhong)的(de)(de)汞(gong)對環境(jing)有害，為了保(bao)護(hu)環境(jing)，在購(gou)(gou)買時(shi)應(ying)選(xuan)用(yong)(yong)商標(biao)(biao)(biao)(biao)上(shang)標(biao)(biao)(biao)(biao)有“無(wu)汞(gong)”、“0%汞(gong)”、“不添加(jia)汞(gong)”字(zi)樣(yang)的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)(chi)(chi)(chi)。