I'd be interested in hearing your experiences
with battery-operated air pumps for transporting fish.

I bought two portables on ebay
(I prefer to support local businesses,
but we live WAY out in the woods
and our closest pet shop doesn't carry these).
These are "Five Plan" brand
and the model is "Atom 2".
With shipping they cost about eleven dollars each.

These are strange little pumps.
About the size of a pager, they take two 'D' cell batteries,
though they run fine on a single 'D' cell.
They are described as 2-speed pumps,
and the second battery is necessary for the second speed,
though there seems to be only something like a ten-percent difference
between the 'Low" and 'High" speeds.

They are not powerful in the sense that the air flow diminishes rapidly
if the air stone is submerged beyond about 20 inches,
but in 16 inches of water they put out as much air
as my AC Whisper pumps.
They are exceedingly noisy;
anyone sitting next to the tank or cooler being used
will have a headache within half an hour
unless they are fans of heavy metal ;=)

These pumps ship with an air stone and twenty inches of air line.
To my surprise, these are good enough that I didn't bother changing them.

I have used these pumps for a total of maybe three hours
and the batteries still seem like new.
I would buy them again,
though if I could find quieter pumps that would be a very good thing.

Does anyone have experience with the Azoo portable pumps?