bluecrow76, thanks for replying.
The Shark Buck would come before the other driver, that's the whole point, I need to lower the voltage getting to the 16 mode driver because it's optimum input voltage is 5V and the 2 Li Ion batteries provide 8.4V max, 8 AA batteries in series in a holder I found here...
http://theledguy.chainreactionweb.com/product_info.php?cPath=48_56_73&products_id=590
Provide 12V max, less using NiMH.
My goal is to have maximum battery versatility I would use my Li Ion batteries normally, but switch to NiMH when the Li Ions could not be charged. I could use 2 of any Li Ion battery that fits, or use two aventrade holders with 14500s in them .
I saw the Assembled Shark Buck with the Remora, I considered it, but I want the other modes offered by the other board.
I think it would work I just need to know what the output voltage of the 3A Shark Buck is with 8.4V and 12V inputs respectively.
Also is the output of the 3A Shark Buck adjustable down to 2.4A using the trim pot, or do I need to swap out sense resistors? Do I even need to lower the output current to prevent overloading the 7135 boards or will the other drivers take only what they need?