Electric eel inspires biocompatible hydrogel battery: https://www.theengineer.co.uk/electric-eel-hydrogel-battery/
(based on paper at https://www.nature.com/articles/nature24670; see also https://news.umich.edu/electricity-eel-style-soft-power-cells-could-run-tomorrow-s-implantables/)

The part that caught my attention is that they're using a Miura fold to simultaneously align and press together many pairs of droplets of four types (salty, fresh water, or two kinds of charge-selective hydrogel), creating an origami-activated electrical discharge.
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