This is a charger that can be set up to charge and condition both the NiCAD and NiMH batteries for the Rolleiflex 6000 and Lens Control S. It's a universal charger which means it can charge all kinds of batteries. You position the contacts which are on horizontal and vertical sliders to fit into the two center holes in the Rollei 6000 battery - it's a bit fiddly but once its set-up you never need to set it again. Alternatively you can purchase an aftermarket cable that will plug into the back port of the charger and connect directly to the battery from LAflex or through me. The great thing about the Maha is that you can see the capacity of the battery in a quantitative way. This charger doesn't just charge, it also conditions. Several repeated full discharge, recharge cycles can sometimes bring the older NiCad batteries back to life by recovering some of the lost capacity to memory issues. A good used battery will show about 500ma/hr on the Maha, and rebuilt batteries will show 850 or more depending on what cells were fitted.
This will also make an effective charger replacement if you have lost yours.