Multiple new batteries failing in my Mac retina Mid 2012


My original Macbook retina mid 2012 battery was dying after 5 yrs of use and 850 cycle.

So I bought a new battery, installed it and after few days of use, the design capacity went down to 81%.Mac shutdown at about 28%. I returned it with no hassle. Battery was a yr old.

Then I bought another one, battery was 5 yrs old. I got the "replace now" error after few days of use.

Then I bought one from amazon, same problem. Few days later I saw the design capacity problem again.

Bought another one in eBay from a reputable vendor. Same capacity design problem, mac shuts down at about 30%. Seller is sending me another battery.

It seems to me the problem gets worse once I start doing calibrations and SMC resets.

I'm starting to thing the problem is somewhere else. Any ideas?

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