Here is a picture of the $2.99 hand powered fuel filler from TSC. I've used these for years and they work great. I set the 5 gallon container on the hood and get it to start pumping, wait till it's filled or container empty then get the container off the hood. I do like the idea of the battery operated one and may get one of them but for 7 times the money I have to worry about keeping a working battery in it. Also when my wife loses this one I'm only out $2.99 instead of $20. For some reason she has to move anything I have setting around.
I've used those for years & they work great. They last a long time. And they're cheap. Now I have something that works even better for me. I have a 55 gal. drum which originally had motor oil in it. I made a 4-wheel dolly for it. I bought a rotary hand pump for it. It's on a concrete floor & I roll it up next to the tractor, put the nozzle in & crank away. I have it filled with home heating oil when the oil guy comes. It doesn't get much handier than that. The reasons I went with the hand crank pump over the electric pump is it's cheaper & I don't have to worry about getting fuel when the electric is off.
I'm not getting any younger & those 5 gal. cans aren't getting any lighter. And I don't have to fight with those "environmentally friendly" cans.