Power System Considerations

[Omegaspecter]

Hello,
I am trying to figure out a power setup for my mech. I know there's a few things I need to consider but I want make sure I am not missing anything.

Hardware:
Sangiuno
Input : (6v-24v's)
Currennt Requirements: Unknown
mah : unknown
16-18AX12 Servo's
Input: (11.1v)
Currennt Requirements: Approxmatly 1amp a servo
mah : unknown
Airsoft gun
Input: 6v maybe more
Current Requirements: unknown
mah: unkown
Camera (trendnet 110w)
Input 5vdc
Current Requirements: 2.5a
mah: 6 Wats (MAx)

1) I think the first question would be what voltages do you need, which I'v posted above.
2) Another question is what are the current requirements. I'v posted what the parts I'v told.
3) And how long you need it to last. (say 17 minutes)

Did I miss any other basic questions? If not whats the next step?

I'm also assuming it's better to get one battery with a higher voltage and step if down due to the weight of many batterys. If this is wrong let me know.

Things I need help with:
How to decide what volatge battery to start with?
How to determine Voltage regulators effects on current and MAH?

[Adrenalynn]

Start with the 11.1v battery for the servos. That's where it'd be tough to get enough current from regulators.

Now toss on some decent BECs for the other voltages. I recommend Castle BEC s.

Get as much current as you can carry, that's the bottom line.