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。

選購(gou)(gou)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)可以(yi)看(kan)這幾點： 【1】選購(gou)(gou)有“國家免檢”、“中(zhong)(zhong)國名牌(pai)”標(biao)(biao)(biao)志(zhi)的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)產品(pin)(pin)和地方(fang)名牌(pai)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)產品(pin)(pin)，這些產品(pin)(pin)質(zhi)量有一定的(de)(de)保(bao)障(zhang)。【2】根(gen)據用電(dian)(dian)(dian)器具(ju)的(de)(de)要求，選擇適(shi)用的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)類(lei)型和規格尺寸，并根(gen)據用電(dian)(dian)(dian)器具(ju)耗電(dian)(dian)(dian)的(de)(de)大(da)小和特點，購(gou)(gou)買適(shi)合用電(dian)(dian)(dian)器具(ju)的(de)(de) 電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。 【3】注(zhu)意查(cha)看(kan)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)(de)生(sheng)(sheng)(sheng)產日期(qi)(qi)(qi)和保(bao)質(zhi)期(qi)(qi)(qi)，購(gou)(gou)買近期(qi)(qi)(qi)生(sheng)(sheng)(sheng)產的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)（新電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)），新電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)性能好。 【4】注(zhu)意查(cha)看(kan)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)(de)外觀(guan)，應選購(gou)(gou)包裝(zhuang)精致、外觀(guan)整潔、干凈，無(wu)漏液跡(ji)象的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。【5】注(zhu)意電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)的(de)(de)標(biao)(biao)(biao)志(zhi)，電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)商(shang)標(biao)(biao)(biao)上(shang)應標(biao)(biao)(biao)明(ming)生(sheng)(sheng)(sheng)產廠名、電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)極(ji)性、電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)型號(hao)(hao)、標(biao)(biao)(biao)稱電(dian)(dian)(dian)壓(ya)、商(shang)標(biao)(biao)(biao)等；銷售包裝(zhuang)上(shang)（如2只熱縮或(huo)4只熱縮，或(huo)吊牌(pai)掛卡）應有中(zhong)(zhong)文廠址、生(sheng)(sheng)(sheng)產日期(qi)(qi)(qi)和保(bao)質(zhi)期(qi)(qi)(qi)或(huo)標(biao)(biao)(biao)明(ming)保(bao)質(zhi)期(qi)(qi)(qi)的(de)(de)截止(zhi)期(qi)(qi)(qi)限、執行(xing)標(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)時(shi)(shi)應看(kan)型號(hao)(hao)有無(wu)ALKALINE或(huo)LR字(zi)樣。 【6】由于電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)中(zhong)(zhong)的(de)(de)汞(gong)(gong)對環境有害，為了保(bao)護(hu)環境，在購(gou)(gou)買時(shi)(shi)應選用商(shang)標(biao)(biao)(biao)上(shang)標(biao)(biao)(biao)有“無(wu)汞(gong)(gong)”、“0%汞(gong)(gong)”、“不添加汞(gong)(gong)”字(zi)樣的(de)(de)電(dian)(dian)(dian)池(chi)(chi)(chi)(chi)。