Huh. I always sorta associated the word with a voltaic pile ( https://en.wikipedia.org/wiki/Voltaic_pile https://en.wikipedia.org/wiki/Voltaic_pile ), which...

Huh. I always sorta associated the word with a voltaic pile ( https://en.wikipedia.org/wiki/Voltaic_pile https://en.wikipedia.org/wiki/Voltaic_pile ), which... https://en.wiktionary.org/wiki/pila https://en.wiktionary.org/wiki/pila gives an etymology of coming from Latin's "pīla" = "pillar", which feels close? Or maybe it's just a coincidence.