If anything is a dud it is not your battery it is the use of some vintage charger. I seriously think there is nothing wrong with your Nimh pack. First enough already with all the cycling especially since your not even fully charging your Nimh pack properly. The proper first charge for your 2000mah Nimh pack should be 200mah and fourteen to sixteen hours. Not 125mah, I doubt you are fully charging your pack.

John