Like I said I have the kill-a-watt device which tells me a hole heap of ermm electrical things about what is going through the A/C unit. If that helps at all i could run that.. and report back on the numbers of various settings ??
So batteries can either be AC or DC depending on what you buy ?
What would typical AA/AAA batteries be ?
and lets say I get batteries to match the 2v AC... then err what is the next step ? can you pretend your giving the answer to a 5 yr old ??
No, batteries only provide DC power, there's no such thing as a AC battery. AA/AAA size batteries are 1.5v DC. You power adapter takes AC from your outlet and converts it to DC for your device to use... that's why it's called an adapter.
You kill-a-watt is useless in this case, because it only measures your socket and the power adapter, not what your device uses. If you want to figure out the device, you'll have to properly hook up multimeter to the correct places.
After using the multimeter to figure out the voltage and current (amps) that your device needs, you'll have to figure out how to connect the proper battery to it. This is possible to do, but based on your background on this sort of thing, it's probably not worth the effort to do. You can't just go out and buy a 2v battery, I don't think any exist. Closest is the standard household 1.5v alkaline battery, or stack two 1.1v lithium polymer for 2.2v (although I don't suggest you messing with these, could explode if you don't know what you're doing).
Devices typically have a range of voltage they work with. A little under might be ok, but if it's too low, it won't run at all. A tad higher might be ok too, but if voltage is too high you'll fry the components.