That’s far more than I want from a flashlight.
On/off. That’s literally all it needs to do. I’d like to be able to plug it in and charge it but quite frankly if I can’t get that without it just going on/off with the single press of a button I’ll replace batteries until the day I fucking die.
I use a pocket flashlight daily. It is an integral part of my job. I use flashlight in a wide variety of light conditions and different levels of reflectivity.
I have never wanted my flashlight to flash on and off, change brightness, or any of the other random crap they force in to what should be the simplest tool in my toolbox.
Press button. Change state of light. That is literally the only thing it needs to do.
Hey if the batteries are that old you should replace them anyway. Every year or two it needs new ones. They will eventually start leaking battery acid and fuck up a good flashlight