4s 8000 lipo what brand?

[hemiblas]

3V should be fine but 3.2V is better as everyone has montioned. As the linc says at 3v you will squeeze a bit more runtime out of the pack as the cutoff will get hit later. Easy way to figure runtime is 4sx8k =32 6sx5k = 30. 32 is greater than 30 so its more runtime. You have 4 8000mah cells vs 6 5000mah cells.