[Kevin Sevcik]

The camera 5V light is only going to tell you is your power is below 5V. Or at least, below a little above 5V. The camera power supply is what's known as a "buck" power supply, meaning it reduces some variable higher voltage (~12V) to some stable lower voltage (5V). It's not capable of increasing voltages, so it will stop working when the battery drops below 5V.

The 24V power supply is a "boost" power supply, meaning it increases some variable lower voltage (~12V) to a stable higher voltage (24V). It will keep the 24V stable over a considerable range of input voltages, but it can't work miracles. Or, at least, it has to be designed with some minimal constraints in mind. So if your voltage drops below (I think) 6-7V, then it will stop working. However, that's much lower than the tolerance of the IFI controllers, which is why we're not using backup batteries this year. Plus, if your battery gets that low, it's not going to be operating any motors anyways.