You've confused energy with potential (voltage). Despite the potential being extremely high, the energy is very low. Otherwise these people would not only be receiving shocks, they'd be burned and/or electrocuted. A capacitor the size of a typical shampoo bottle can definitely hold a lethal amount of energy.
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Could this be used as a new type of battery? It seems to hold way more energy than a typical capacitor.
You've confused energy with potential (voltage). Despite the potential being extremely high, the energy is very low. Otherwise these people would not only be receiving shocks, they'd be burned and/or electrocuted. A capacitor the size of a typical shampoo bottle can definitely hold a lethal amount of energy.