I'd forgotten that technique! But then, presuming those batteries were for bicycle lights, that's probably because I do my best to forget those dreadful lights.
Oh yes, best to forget about those lights that almost did not produce any usable brightness.
I found they were bright enough - but only until you really needed them. Either the bulb had broken, or the battery run down, or the contacts corroded, or the torch fell off its holder and broke when it was run over by a car, or...
This is a picture of a typical light and battery of my childhood.
Thank you
so much for that - not. (Details omitted to avoid giving people "of a certain age" a heart attack).
On second thoughts, there is an advantage to your post... Whenever someone claims it was better before, then I can use those diabolical devices as a counterexample.