... batteries about over-discharging, over-charging, high temperature, and so on.3. Green power, ST battery is free of Pb, Cd, Hg ... temperature range 0 degree to 40 degree; specially designed battery used in high or low temperature.8. No memory effect, they can ... .9. Handling performance, maintenance-free and wide application. F13000mah 24v ni-mh rechargeable battery pack