Brilliant video above , not sure why he put a 1 Ohm in series , better to take one cell out and use 9 AA ....

Well there we have it , just 10 or 9 AA cells will do it , ...

Someone needs to make a product holding 10 AA cells with a plug in car socket ... just a few $ , batteries not included ... they must make a video like the one above to convince people it will work ....

This will be much more convenient than the "Mighty Jump" as NIMH do self discharge will be flat in a year and need recharging .. alkaline have a shelf life of over 5 Years according to the expire by date on my pack ... This is the sort of product you only use once every 3 years or so ...

You can discharge domestic alkaline at 2A ....(Ignore the E2 curve it's lithium) As the car battery rises above 12V , the current will drop allowing the voltage from each alkaline to rise higher than the chart shows for 2A. discharge

 

You should keep watching them. He next uses some super-capacitors and then tries with a truly dead battery with not such good results. NsaSpook turned me onto this guy and he makes some very good videos that are both very instructive as well as entertaining.

 

Without any sound the video is fairly useless. And the car in the picture did not have a dead battery.
AND none of the wiring looked like it was good for even one amp. So while a big string of AA batteries may be able to do something as to adding a bit of charge to a slightly-to-weak battery I would not guess it to be worth the price, because most battery problems are not that simple. There is not much substitute for jumper cables that can deliver 10 to 20 amps for several minutes. Folks can wish it were true, and marketers can show all sorts of numbers, but reality is usually quite brutal.
So the wonderful AA cell device might work in a carefully selected situation, that particular type of problem is not the common one.