計算鎳氫電池充電時間的公式：hr = mAh / mA，“?小時?”等于“?電池尺寸（毫安小時）?”除以“?充電器輸出功率（毫安）?” 。

鎳(nie)氫電(dian)池(chi)充(chong)電(dian)過程手動計算公(gong)式：

AAA – AA – C – D尺寸可充(chong)電電池：小(xiao)時(shi)(shi)（充(chong)電時(shi)(shi)間）等(deng)于12 x Ahr =小(xiao)時(shi)(shi)OR 12/1000 x mAh =小(xiao)時(shi)(shi)（12/1000 x mAh =充(chong)電小(xiao)時(shi)(shi)數），使用(yong)此(ci)手動(dong)公(gong)式(shi)計(ji)算的(de)示(shi)例; 使用(yong)100 mA充(chong)電器計(ji)算2400 mAh NiMH AA尺寸1.2v可充(chong)電電池的(de)充(chong)電時(shi)(shi)間長度。

其次使(shi)用功(gong)率為(wei)3.5 mA的350 mA電流輸出(chu)電源充電器：

100mA電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)：12：1000 = 0.012 ；0.012 x 2400 = 28.8（小(xiao)時(shi)），使用(yong)100mA電(dian)(dian)(dian)(dian)流(liu)輸出(chu)的(de)充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)為(wei)2400mAh電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)或(huo)充(chong)(chong)電(dian)(dian)(dian)(dian)需(xu)要28.8小(xiao)時(shi)（28小(xiao)時(shi)48分鐘）。

350mA電(dian)池充(chong)電(dian)器：12：1000 = 0.012 ；0.012 x 2400 = 28.8 ；28.8：3.5 = 8.2（小時），使用具有350mA電(dian)流輸出的(de)充(chong)電(dian)器為2400mAh電(dian)池充(chong)電(dian)或充(chong)電(dian)需要(yao)8.2小時（8小時12分鐘(zhong)）時間。

這(zhe)次是為(wei)1800 mAh 1.2 mA 鎳氫電(dian)池aa型可(ke)充電(dian)電(dian)池充電(dian)，并使用相同的電(dian)流充電(dian)器：

100mA電(dian)池(chi)充(chong)電(dian)器：12：1000 = 0.012 ；0.012 x 1800 = 21.6（小(xiao)時），使用(yong)具(ju)有100mA電(dian)流輸出的(de)充(chong)電(dian)器為(wei)1800mAh電(dian)池(chi)充(chong)電(dian)或充(chong)電(dian)需要21.6小(xiao)時（21小(xiao)時36分鐘）。

350mA電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)器(qi)：12：1000 = 0.012 ；0.012 x 1800 = 21.6 ；21.6：3.5 = 6.2（小時(shi)），總共需要6.2小時(shi)（6小時(shi)12分(fen)鐘），使用350mA電(dian)(dian)流(liu)輸(shu)出功率的(de)充(chong)(chong)電(dian)(dian)器(qi)為(wei)1800mAh電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)或充(chong)(chong)電(dian)(dian)。

9v（9伏）可(ke)充電(dian)電(dian)池：小時數等(deng)于(yu)電(dian)池mAhr / 10（mAh / 10 =小時）