Board Thread:Naruto Discussions/@comment-25977287-20150704114842/@comment-25467892-20150706052548

Madez,

No he wasn't. He said himself during the attack of the God Tree that between his techniques and the tree he was running so low on chakra that he couldn't teleport, and that was when he still had the Yin Half of the Kyuubi to give him more power. After he had lost the Kyuubi, he was running low on energy.

His chakra recharged enough to fight, but there was never any indication that he was fully restored when he went into Sage Mode.