I'm looking to make my mesh extender battery-backed-up...although I can find pictures of the circuit board, I can't find a circuit diagram.

Anybody know what it's power supply output voltage(s) might be?
Most of its chips will be consuming 1.8 and 3.3 VDC, but I don't know if those are achieved by a resistor/regulator off a main power supply (e.., 5VDC), or if the devices need both + and - supplies.

If I don't find anything out here, I'll just pry it open and see...

Thanks in advance for any tips.