In this chapter 591, Madara clearly says having an undying body and unlimited chakra. Let me explain this to you...
The 2nd Mizukage got tired, cuz he was weakened by enemies
Madara, he not only has extremely powerful chakra, but due to hashirama's cells, he now has an EXTREMELY POWERFUL MASSIVE CHAKRA POOL and since he's an edo, his chakra is not infinite, it is unlimited, meaning it stays the same at all times.
infinity and unlimited are two different things if you think about it
Happy?
The 2nd Mizukage got tired, cuz he was weakened by enemies
Madara, he not only has extremely powerful chakra, but due to hashirama's cells, he now has an EXTREMELY POWERFUL MASSIVE CHAKRA POOL and since he's an edo, his chakra is not infinite, it is unlimited, meaning it stays the same at all times.
infinity and unlimited are two different things if you think about it
Happy?