Where did you get your replacement battery from? I was looking into replacing my battery, and my options for sourcing the part appear to be Amazon or iFixIt. The former’s reviews are show a number of people complaining that the part they received was of poor quality and barely held a charge (although this might be a vocal minority? Hard to tell). The latter is almost the price of just getting Apple to do it in the country I reside. What route did you take?