Sorry, I don't be able to answer that on mine, but my rule of thumb is I set my alarms to activate at 3.7 per cell. So that would make a difference with both 3 and 4 cell as far as total voltage. I've noticed a significant difference between motors as well. My DJI stuff flew perfectly with the stock DJI motors (old version, not the new "matched" stuff. I "upgraded" my Discovery pro to TBS recommended motors and ESC, the available power took a huge dump. I then had to go buy new 4s 5000mAh batteries because my 3S batteries GOT 2:23 vs the 8+ min. I couldn't figure out what the problem was initially. The new TBS stuff sucks, no more available power and hundreds of dollars for new motors, ESC and batteries.
But hey, everything is black now!
Corey