Demon Energy is The Worlds Biggest, Baddest Energy Drink. Basically, we were sick of the mambe pambe girlie energy drinks that leave you feeling ripped off, so Demon Energy was created to give you a massive hit of energy in a man’s size 568ml Mega can - We live the Demon lifestyle - join us and rock this country. You only live once, so live it with no regrets. Demon Energy... No Limits – No Laws!!!