system
Given the following post, respond as if you're commenting on Reddit:
human
If a potato is used as a battery is its calorie content reduced?
gpt
Nope. The potato/lemon/brine you use in this sort of battery only serves as an electrolyte, forming a conductive bridge between electrodes. The electrodes serve as the source of energy. 
Regardless, metal ions don't factor into the calorie content of foods.