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)(dian)(dian)(dian)(dian)池(chi)可以看這幾點： 【1】選購(gou)(gou)有“國家免檢”、“中(zhong)國名(ming)牌”標志的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)產(chan)品(pin)(pin)和(he)地方名(ming)牌電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)產(chan)品(pin)(pin)，這些產(chan)品(pin)(pin)質量有一定的(de)(de)(de)(de)(de)保(bao)障。【2】根據(ju)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器具的(de)(de)(de)(de)(de)要求，選擇適(shi)用(yong)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)類型(xing)(xing)和(he)規格尺寸，并根據(ju)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器具耗電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)大(da)小和(he)特點，購(gou)(gou)買(mai)適(shi)合用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器具的(de)(de)(de)(de)(de) 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)。 【3】注(zhu)意查(cha)看電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)(de)生(sheng)產(chan)日期和(he)保(bao)質期，購(gou)(gou)買(mai)近(jin)期生(sheng)產(chan)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)（新(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)），新(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)性(xing)能好。 【4】注(zhu)意查(cha)看電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)(de)外觀(guan)，應選購(gou)(gou)包裝(zhuang)精致、外觀(guan)整潔、干凈(jing)，無漏液跡象的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)。【5】注(zhu)意電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)(de)(de)(de)標志，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)商標上應標明生(sheng)產(chan)廠名(ming)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)極性(xing)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)型(xing)(xing)號、標稱(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)、商標等；銷售包裝(zhuang)上（如2只熱縮或(huo)4只熱縮，或(huo)吊牌掛卡）應有中(zhong)文廠址、生(sheng)產(chan)日期和(he)保(bao)質期或(huo)標明保(bao)質期的(de)(de)(de)(de)(de)截止(zhi)期限、執(zhi)行標準的(de)(de)(de)(de)(de)編號。購(gou)(gou)買(mai)堿性(xing)鋅錳(meng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)時(shi)應看型(xing)(xing)號有無ALKALINE或(huo)LR字樣(yang)。 【6】由于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)中(zhong)的(de)(de)(de)(de)(de)汞對環境有害，為了保(bao)護環境，在(zai)購(gou)(gou)買(mai)時(shi)應選用(yong)商標上標有“無汞”、“0%汞”、“不添加汞”字樣(yang)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)。