Board Thread:Naruto Discussions/@comment-25977287-20150704114842/@comment-25467892-20150706230928

Yes, that's why I referenced it, him getting his chakra drained by the God Tree during the attack, and by his techniques as he said.

Madara was stated to have tremendous chakra because he was an Uchiha, Indra's reincarnation,, and he had Hashirama's cells in addition to being an Edo summon. In his case, his reserves were so massive that together with his recharge rate he might as well have had unlimited chakra, he had the chakra of Indra and Asura combined.

Hashirama gave Sasuke the last of his chakra, Minato said that he was running out of chakra, Tobirama mentioned that he could only teleport one person with his current level of power. There were many, many instances of an reincarnated person running out of chakra.

Minato casts techniques after 646 with Kyuubi's chakra, we've seen Yang and Yin Kurama gather their own chakra quickly so that's no surprise.

And yes, I stand by my statements because the last word we have from Minato is that his own chakra reserves were almost empty and after that we saw him relying on Kurama. And we don't know how quickly a summoned reincarnation's chakra regenerates save that it is quick, hence why I said that Minato had enough energy to fight, but he wasn't running with full power as of the time he went into Sage Mode.