Understand that these settings are only going to help the battery indicator on the device to be a bit more accurate...has no effect on the battery life or run time. Again, depending on circumstance, you will probably never find any 2 Wh's generated with the battery analyzer exactly the same...use what works for you! 2.75 is a safe value for the cell soft cutoff for the 18650's, but if you feel 2.8 is safer, then by all means...this is only a cell SOFT cutoff value, where the board will throttle back the wattage & you will get the Weak Battery message(flashing battery indicator)...IIRC, for safety reasons, the board will shut down at 2.5v & you will get the Check Battery message...The higher you set the cell soft cutoff value for, the sooner the board will start throttling back the wattage...