I know AA batteries were a common power source back in the day when mods were literally modded project battery boxes. They had two issues:
1: non rechargeable batteries get expensive quickly
2: such batteries only make 1.5v. The rechargeable only do 1.2v. This means to get the normal 3.7v you need a 3 battery mod and it will only produce the 3.7v for a little while.
The device here is a two battery AA mod, so it’s probably set up to run at 2.2v like an old fashioned cigalike. Which means you will get performance on par with an original blue in a fairly large mod that is expensive to run