Hello and welcome, Kevin.
If there ever was a description of a defective device in these forums, that one you just gave takes the prize!
Let me ask you what you mean when you say, "..I just got myself a galaxy ace 2.." Did you purchase it (with factory warranty and or insurance) at a carrier store or Best Buy, etc? Or did you get it on Ebay, from a friend? etc etc.
At any rate, if purchased from a retail outlet, take it back. If acquired in some other way, well... you have a few thing you can try, but for the most part you may be out of luck. I'd try to find signs of water damage, physical damage from being dropped etc, for example.
No battery? You had to get a battery for it? Please post details about how/where you got the device.
Meanwhile, have a look at this page for instruction on how to reset the Galaxy Ace 2:
Samsung Galaxy Ace 2 i8160 hard reset - PDA Smartphone PNA hard reset soft reset
Button combination resets are good for devices on which there is no access to the operating system.