If the battery is to run the motor to pump the thing up, what about a bike pump? I'm sure you have one of those around somewhere

- do you have a fitting to allow the bike pump? The air mattress I used to have, seemed to connect to my bike pump pretty easily.
Me, I prefer a cot, with an egg-crate mattress, two actually. Air mattresses always manage to loose air during the night, and they smell funny.