Can I use my old version Ni-Cd battery charger to charge my Ni-MH batteries?

 No, you can use a new Ni-MH charger to charge your old Ni-Cd batteries but you should not try to charge Ni-MH batteries with a Ni-Cd charger. Here's why: Ni-MH and Ni-Cd batteries are chemically very similar and when both are fully charged the battery voltage will start to drop. The Ni-MH voltage drop is much more subtle and more difficult to detect. Ni-MH chargers usually have an over-temperature sensor and shutoff to prevent overcharge as well as a more sensitive voltage drop detector where Ni-Cd chargers usually only use the voltage drop to determine when to stop charging. If you charge Ni-MH batteries in a Ni-Cd charger it will probably miss the voltage drop and keep right on charging causing the batteries to overheat. Overcharging and overheating Ni-MH batteries can damage them internally and reduce battery life.
More info: laptop battery

1. Does it really help to store batteries in the refrigerator?

2. What is the "Memory Effect"

3. The rating for battery

4. How can batteries be connected?

5. How to maximize battery performance?

6. What is the difference between Ni-Cd, Ni-MH, and Li-ion?

7. How do I identify my battery?

8. What is a battery?

9. What is the best battery for laptop ?

10. How long will the new main battery power the laptop and How long does battery last?