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MacBook Pro 13" Unibody (Mid 09Mid 12) Replacement Battery / Fix Kit Replace a 5800 mAh battery compatible with MacBook Pro 13" Unibody (Mid 09 to Mid 12) 635 Watt Hours (Wh), 1095 Volts (V)Then walk away for 40 minutes When you come back, note down how much battery life you have left again If there isn't a big change while your MacBook Pro is asleep, you're probably okay, and your battery life will return to normal when your usage returns to normal — you know, after the novelty factor wears off09 Mid 12 13" MacBook Pro battery 15 Review(s) 5 0 5 How To Buy Macbook Pro Batteries 9 Steps With Pictures How to improve battery life on macbook pro mid 2012