I actually get double use out of my old batteries.
I built a small charger that trickle charges them
They last about 3/4 of the time they did as an original battery.
Then I toss them in the trash. No recyclers here for batteries.
Yes I know the potential for alkalines, etc that are recharged for leakage, explosions, fire, etc. It started off as an experiment with some EE friends. We found it to be safe with the proper charger (not the ones designed for rechargeables !)
I had maybe one battery leak in the last few years.
I don't recommend everyone do this , its a do as I say not as I do type of thing.
Yeah I'm cheap
Note about NiCd batteries.
The cadmium is actually toxic to people/fish
When the first food canning was done they used cadmium for the cans because it was an easy to work metal.
Then they sealed the lids on the cans with lead solder.
That had to be good eating