We used to have an advert in which lots of little fluffy bunnies with a drum around their necks raced against each other. All of them stopped at some point, except one: the Duracell bunny. It had enough energy to last much longer than all the others... Ever since then, people who are always so energised have been compared to Duracell bunnies. I like the electric eel even better in this context!
I think we had a similar advert by Duracell but that was not about race. However that advertisement is still available on youtube
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Hihi! Same campaign I think. Cool!