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Can you please help me I installed the battery into my macbook pro 2014 a few months ago and everything was fine and now it’s only operating at 50% capacity and i’m getting less than 4 hours life on it. I have tried a battery calibration, a SMC and a PRAM reset and i still get a “service recommended” warning on the battery

Can you help me please?

You’ll need to contact the iFixit Store - Customer Support for a warranty exchange.