Ni-Mh Battery

Ni-Mh is stands for Nickel and Metal Hydride. In this kind of battery Nickel Oxide Hydroxide is as in Ni-Cd battery but in place of Cadmium, the negative electrode is made of hydrogen absorbing metal. It has 2-3 times capacity of same size NiCd battery.

Basic properties of Nickel Metal Hydride Battery

1.Specific Energy Density                 60-120 Wh/Kg

2. Internal Resistance                               33-50 mΩ/Volt.

3. Charge-Discharge Cycle Life       300-500

4. Charge Time                                  2-4 Hr

5. Overcharge Tolerance                   Low

6. Self discharge/Month                    30% (at room temp.)

7. Cell Voltage                                    1.2 Volts

8. Charge Cutoff voltage                   indicated by Voltage Signature

9. Discharge Cutoff voltage              1 V/cell at 1C (min.)

10. Peak Load Current                     5C

11. Peak load Current                       0.5C (for best results)

12. Charge - Discharge Temp.          0 to 45 degree C (for best results)

13. Maintenance requirement          60-90 days discharge

14. Safety requirements                    Thermally stable

15. Toxicity                                         Low