Choosing a power supply for paralell charging...

I have about a dozen 40ah lifep04 batteries (split into 3 packs, of 4 parallel cells each) that I want to charge, and I was hoping somebody might be able to give me some advice on which power supply I should go with. The two that best seem to fit my needs are the meanwell rsp-500-3.3 (or possibly rsp-500-4) and the MSP-600-3.3. I was thinking that the rsp-500-4 might be nice to have around incase I wanted to charge lipo cells, since the voltage can be adjusted from 3.6v to 4.3v, but I'm concerned that dialing the voltage down to its absolute minimum like that would interfere with the current limiting functionality. These things work by folding back voltage until the desired current range is reached, right? Would adjusting the voltage all the way down not interfere with this process?

Any advice you all can provide, would be appreciated.