General Samsung Galaxy Ace or Mini 2? =IMPORTANT=

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http://androidforums.com – Hello everybody! I'm looking for a smartphone to buy, but I can't choose between Ace and Mini 2. Wich one is better for the battery life time? If you already have one of them, then which do You recommend? I know, that Ace has a better camera and a flash, but it's older and slower than Mini 2. Mini 2 has a battery capacity which is less than Ace's, but screen is less too. So i think, that Mini 2 should last for longer. Am I right? Please, if you know something about it, tell me. P.S. Sorry for my bad english :P (General)