... 6 battery, high-power battery, environmental battery, Hg ,lead and Cd free, high capacity, high magnification Chemical system Zn/Mn ... environment3, Because of easy to use, long storage period and safe, R40 battery is the emergency power supply4, high ... teaching , SPC telephone, railway lighting lamps and lanterns ,communication equipent ,navigation mark, coal mine and so on r40 is the ideal power ...