1) What is the voltage, open circuit and hooked up to your laptop for the charger that works?
2) What is it's current rating?
For example the charger that does not work is 19.1V open circuit and 17.5V when connected, it;s current rating is 4.74A.
3) When you charge the batteries with the other charger, does the computer tel you that it is 100% charged?
4) How long can you run the computer on the battery pack before you need to charge it?
5) When you use the "bad" charger, does the computer turn on at all?
6) When you use the "bad" charger with the battery pack removed, does the computer turn on at all?