Tray
I have a couple of Integy trays with light bulbs and diodes in them. They take the cells down to 0.0 each if you leave them in long enough. What i do for NIMH is unscrew the bulb when each one goes out. It is real clost to .9 volts. This will equalize an unmatched pack.
I also have a PROmatch Smart Tray*. It has diodes, puts a little heavier load on each cell and automaticlly shuts off at .7 volts per cell because that is the voltage drop across the diode.
Promatch doesn't make these any more, but still have them in stock. I bought a 2 X 4 Smart Tray* for my 4 cell AND 6 cell packs. I do not use it every time. I think it is the best made one I have seen yet, it makes a great connection every time, had huge thumb screws and spring steel contacts that make putting even a not so perfect made pack easy. It also has lights that show contact for each cell.
NO AFFILATION Yadda Yadda
I RUN FU BATTERIES!
David Root