You can, especially if you have lots of money for batteries. Typical low point for a cell runs between 3.4 and 3.7v/cell. Those that go for the lower values replace batteries a lot more often than those than stay to the higher side. Your battery has 4 cells, do the math and make your choice. Personally, mine's on the ground by 14.8v, with a rare exception down to 14.7v. I never receive a battery warning. Getting one means I flew the battery down too far for my safety limits.