I just meant depending on the termination type. 187V CCCV charger would mean if it "terminates" by just holding the 187V open circuit hence it would be a 187V CCCV charger. 183V with a rebound down would be if it terminates by sensing when the current dropped below the output knobs setting. If that is the case then it would terminate when leaving the CC region at 183V at the full amps hence the LTO chemistry would rebound down over the next few hours to lower than 183V to probably somewhere around 180V. I didn't see anything in the datasheets that definitively makes me think one or the other is more likely. As far as the better fit I just meant most are trying to stay in the 2.0V-2.5V range to stay on the flat part of the LTO chemistry which would be a good fit for if it terminates at 183V since 187V is 2.6V per cell where the LTO slope starts to get steep (not awful but not flat either).^ Not sure I understand: '183V rebound down', '187V no rebound'? What are we talking about here?
Basically, if I'm understanding the difference between the "A" and "B" model correctly, the CC + CV model is closer to what you'd want in a charger, you'd just get that one and not worry about return policies.
You want to be able to set an upper voltage threshold suitable for the pack (or particular circumstances - maybe sometimes you want 180V, another time you want 172.8V) and be assured the power supply won't breach that - and do it in a controlled way, a way that it's designed for. That's the CC + CV "B" model. I don't know exactly how the other one handles the transition at max user-set output voltage - but it's not what the CC+CV model is, otherwise, there wouldn't be a CC+CV model. My guess is that it's not a very 'elegant' affair...
As far as the output knob while it does alter current and voltage, it's really based on the current. The knob all the way would be the 1.75A and the know all the way down at 50% is .8875A. This makes the voltage differential that the power supply is tracking all the way up change but it isn't about the end state it's about how many amps are flowing in the CC region. These are LED power supplies so lowering the current would change the brightness of the LED lights. I definately don't know of power supply that essentially lets you program when to switch from CC to CV other than the Powerlabs or IChargers and they are essentially just middle men that still need a power supply or other power source.