Yes, using an battery health app. I reset the PRAM and SMC.
See stats attached.
The 5 year battery age contributed more to the 20% capacity loss than the # of cycles obviously.
Heat & cold cycles over its history can also affect battery health. Maybe it was rarely fully drained, albeit that's less important in modern lithium cells than it used to be.
FWIW, drain your battery fully, then reset PRAM/SMC and fully charge it while not using it at the same time.
$440 is a good deal. I wouldn't bother replacing the battery until it hits 60% or less.
Batteries are unfortunately the consumable part of every electronic gadget and need to be replaced eventually.
I have a friend that used a white MB from 2006 until 2015 with the orig. battery, down to less than 15% capacity, but she didn't travel further than from kitchen to living room, so having it always plugged in gave her 9 years usability for light work. Somebody still gave her $75 for it.
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As a reference:
My Macbook Air early 2014 model, after 2 years of usage, 121 cycles but still 97.9% of design capacity.
And yes, I plug it on the power source all day long.
Therefore, I would not consider your macbook battery good, but not too bad either. If you worry a lot, consider replacing one but I would discourage this option.
That's excellent stats. Did you buy the '14 model only in 2015 ?
Is the battery age 2 or 3 years ?
In any case, OP's 5 year battery is about right in capacity depletion for that age. I estimate about 5% loss per year of usage with an average of 50 cycles a year, so you're doing great if your battery still shows 97%+.
