Hi. I was bought brand new original battery from private seller to my 2010 macbook pro. I have a problem. My battery capacity is decreasing every charge. On first plug it was 100%, then 95, 88, 85 and now its 78% capacity.. I was perform reset SMC and calibrate battery, but nothing changes. My system is yosemite 10.10.4. Is it normal or maybe battery is broken ? Thanks in advance!