That's actually the one I have the iMax B6 works great with my li-po. smooth and easy, and I love it.
But my buddy's Ni-Cd, I set it so it's at 0.1A nicd charge and max current is 0.5A but it always shuts down after a minute. Then the warning "Break Down" pops up and stops.
Manuel just says (The Charger has malfunctioned for some reason, Seek professional advice) Not sure why, but if you re-start it a few times it runs and charges for about 15mins at 0.5Aand then same warning pops up.
Thinking he needs a higher end charger!?