Question: How do Electric eels generate their electric current?

Stéphane Berneau answered on 5 Mar 2018:

Electric eels have a specialized electric organ containing electric cells (called electrolites) which work like mini-batteries. By a nervous activation, the cells will synchronise and generate a big power voltage (some researchers say 500 volts). It can be activated to tase their prey or shock a predactor.

Please find a recent video that I enjoyed watching about eels and electric shock:

I hope I have answered your question.