... , Number 6, R40. Description:Zn/Mn battery, R40battery, No.6 battery, high-power battery, environmental battery, Hg ,lead and Cd free, high ... capacity, high magnification Chemical system Zn/Mn(Zinc/Carbon)Nominal voltage 1 ... not ideal)6, R40 is the best price performance in dry cell, It can be single use only, also can form ...