Regarding LiFePo4 batteries, typically 4 cells in series is better than 3.? With only 3 cells, it will be just under 11V folly charged and will go down to 9V when mostly dead.
3S is better for LiPo or Li-Ion which are at 12.6v fully charged and drop down to 9V mostly dead.? This is a little low, but 4S Li-Po would be 16.8v fully charged, which is well above published voltage ranges for most rigs.
With 4 cells you are at 14.6V fully charged and 12v nearly dead, which is nearly a perfect voltage range for electronics designed around 12v automotive power.
