To all those who think itachi has low chakra reserves, what makes you say that when he spamed a shit load of MS techniques against sasuke, got tanked head on by a full kirin and in the process sealed orochimaru who summons a huge free king eight headed serpent which it itself tanked susanoo again right after kirin, and then the chackra it took to transfer amatrasu to sasuke. ALL THAT WHILE HE IS EXTREMELY SICK AND HALF FREAKING BLIND! Not to mention the blow to his damn leg and all that chakra he wasted on genjutsu! And not only that, Hitachi has more chakra than sasuke because during their fight half the time sasuke unsealed oros curse mark. Now imagine itachi in his prime state. Use common sense people. itachi DOES NOT have low chakra reserves. Although it may not be the greatest reserve of chakra he has, it is still not low. Logic people, use it. :scorps:
EDIT: Forgot to mention that he also has enough chakra to casually keep his sharingan on. Also people please, Kakashi's chakara does not come close to itachis...also not to mention that itachi was already dying in the beginning of his fight with sasuke from his deseas. (Proof is him coughing up blood and Zetsu himself said that was not normal)