well
1- Capacity cutoff
say if you buy some cheap cells like 10 000 mAh D cell,s but in real life they only take 4500 mAh and the second one takes 5200 mAh and the third one takes 4700 mAh and the fourth takes 5300 mAh so you have to set the capacity cutoff to the lowest mAh rating so the other 3 batteries dont get to take there full capacity.
or worse the guy who is new to hobby chargers sets the capacity cut off to 10 000 mAh and there for over charges the batteries, or he buy,s some cheap 2400 mAh 18650,s that only take 900 mAh not as much of a big deal with li-xx as its about voltage not peak, but there still is the potential of over charging.
to truly set the Capacity cutoff for nimh you have to cycle each battery a good few times till the battery has leveled out and set it to the lowest of all batteries you have or record the time and mAh of every battery you have and mark them and change it to suit each battery, but to do this you have to cycle the batteries and if the delta peak does not work well its to late then realy isnt it as the batteries could already be cooked by some one who does not under stand.
2- Timer cutoff
we that works much the same way as the capacity cutoff, if will depend how many mAh the battery will take, if the batteries are dead flat, half flat or doing a quick top up, or you have to fully discharge them to the minium voltage and full charge each battery and with the maxium discharge of 1 amp that the imax b6 has that can take all day with big cells.
to truly set the Timer cutoff for nimh you have to cycle each battery a good few times till the battery has leveled out and set it to the lowest of all batteries you have or record the time and mAh of every battery you have and mark them and change it to suit each battery, but to do this you have to cycle the batteries and if the delta peak does not work well its to late then realy isnt it as the batteries could already be cooked by some one who does not under stand.
this feature is best to make sure you dont forget and leave your charger charging all night
3- Temperature cutoff
is the best one, but it will depend if its a hot day or a cold nite or summer or winter inside side or out side charging as for me there can be upto 20 degrees diffrence but it has to be the best out of the 3 saftey features, realy you need a good charger with delta peak or where you can adjust the sensitivity so you dont damage you nimh.
its all trial and error with out a good working charger and people new to the hobby chargers can get it wrong easily i have owned a couple of imax b6,s and a imax b6 ac and my old man still runs his imax b6 it pays to check with a DDM and set all cut offs on the safer side (low).
there is alot of factors, users, batteries and conditions its hard to say one settings suits all.