Brent,

Just because you were talking about batteries, I had a thought.

Many years ago, when I worked I owned a sporting good company in New York.

We sold and serviced Shakespeare Trolling motors. One day I had Poloroid camera that took the film pack that also contained the battery to drive the camera. When the film was done you threw out the empy film container that still had the battery in it.

One day, I decided to break open the film cartridge and see what the battery looked like.
It looked very similar to a lipo pack, very thin flat pack,maybe the size of a cigarette pack, but only 1/4" thick. I remember reading the voltage and it was close to 12v.

I had no idea of the amperage capacity of this pack and keep in mind it was only designed to deliver enough amps to drive the Poloroid camera until the film was used up.

I had a 12v electric trolling motor that I just had to try and power with this battery. These motors would typically draw some pretty high amps when hooked to a deep cycle trolling battery.

The tiny little battery actually powered the motor and had the prop spinning pretty good.

The test was very incomplete and I never tried to read the amp draw or let it run for very long.
I was just amazed that it would actually tirn the motor over.

I recently tried to buy a film pack from a store and they said the new cameras have a separate battery for the camera. I don't know if you can still buy the old film packs anywhere.

It would be interesting to know what they were rated at. They were also very light weight.
I would love to find one and try it in a plane.

I thought if they were used by Real estate people or someone like that and you could get them to save their old packs for you, you might have a free source of batteries that you could fly with.

This was about 20years ago.