That was an issue with the MRC Super Brain 969 Pro. Its algorithm didn't automatically shut off, and you had to monitor the charge and manually stop it from what I heard. Aside from lithium charging problems, it worked fine with all other cell types. The lithium problems were resolved, and a more powerful power supply was added for the Super Brain 977. That isn't much concellation if you owned the older one though.
So MRC did the honorable thing and gave anyone who bought the charger a free upgrade to the Super Brain 977 software which did not have the defect. You could even pay a small fee and get the 10 amp power supply the 977 had as an upgrade(since 969 shipped with a 5 amp unit).