Board Thread:Theories and Speculation/@comment-25139119-20150807165411/@comment-25122992-20150808144839

It's Tobirama's explanation, not mine. So, Naruto transferred Kyubi's and his own chakra to the shinobi of the Alliance through physical contact => these shinobi used up all his chakra they got => but the link between them and Naruto/Kyubi remained => and Naruto could transfer to them Kyubi/his own chakra any time he wanted, already without the need of physical contacts, only at his own will. I suggest the same principle is suitable for the other Tailed Beasts' chakra inside Naruto: he really can use up all their chakra transferred, but also can ask them for more through TB telepathy, and each of the TB can give it even if they're far away from him.