The nickel-cadmium (NiCd) battery is another common secondary battery that is suited for low-temperature conditions with a long shelf life. However, the nickel-cadmium batteries are more expensive and their capacity in terms of watt-hours per kilogram is less than that of the nickel-zinc rechargeable batteries.
Cd+2OH- → Cd(OH)2+2e-
Charging：Cd(OH)2+2e- → Cd+2OH
2e-+NiO2+2H2O → Ni(OH)2+2OH-
Charging：Ni(OH)2+2OH- → 2e-+NiO2+2H2O
Discharging：Cd+NiO2+2H2O → Cd(OH)2+Ni(OH)2
Charging：Cd(OH)2+Ni(OH)2 → Cd+NiO2+2H2O
1.Nominal voltage is 1.2V a cell; the system is highly steady.
2.Expected designed using life: 20 Years
3.Ambience temperature has small influences on the battery life.
4.Flooded battery needs add water regularly.
5.There's low, medium,high rate
6.Long life of the recycling