Can someone give me tips for wining the second battle againist Xehanort's heartless?

dont know, didnt play much. game got stuff up at tarzan level

Youtube? Just saying.

Use a lot of aeroga and curagas and attack every time you can. That was what I did. See if it work with you ;P

Make sure you have a few elixirs or ethers, not to mention potions, for the fight. Use aeroga, use dodge roll, and hit whenever he has stopped attacking.

Are we talking about the second Xehanort's Heartless fight in the final battle? Or are we talking about the second fight with him in general?

 

If we're talking about the one in the final battle, I'd recommend that you have a lot of elixirs stocked (like DarkmoonTenshi said). Also, when he does that weird force field thing, if you can hit the front of it when he's coming towards you, it'll stop the attack. Also, when the room turns all black, you will only survive by dodge rolling. Beware of Xehanort's guardian, but just attack as much as you can. If you have him on the defensive, he won't be able to use certain attacks as much. If you're having too much trouble you might want to level up.