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2.2 GHz (Turbo Boost up to 3.4 GHz) もしくは2.5 GHz (Turbo Boost up to 3.7 GHz) quad-core Intel Core i7 processor with 6MB shared L3 cache.

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Why is my new replacement battery always dropping from ~80% to ~25%?

My new replacement Mac 15” mid 2014 battery drops from 80 to 25, and then from 20 to 7, consistently.

help!

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Can you tell us which model you have as well as where you bought it.

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Was it used when you bought it?

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new, from this site, in the kit.

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I have the same problem. I post it few hour ago :)

Replaced battery percentage dropping from 70% down to 7%

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It does sound like your battery is defective. Best to contact the iFixit Store Contact iFixit Customer Support

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There is a "known issue" that often the Apple software to report battery condition and charge tends to"fixate" on 96% as the maximum charge... therefore it's good that you are using several different apps, but it appears you are obsessing about your battery state.

Each time you complete a charge cycle, it diminishes battery capacity slightly, but you can put notebook battery through many charge cycles before they will only hold 80% of original battery capacity. Using the battery until it is mostly discharged is wise... but completely discharging the battery is not, unless your Macbook is the one with a removable battery.

So to recap it's not good procedure to never take your laptop off mains power, nor is it good to completely drain your battery, except as a means to rectify having it on mains power for days on end.

OEM batteries are warrantied for a year against defects, and with AppleCare can be extended to three years from the date of your notebook purchase with the AppleCare Protection Plan. However, the AppleCare Protection Plan for notebook computers does not cover batteries that have stopped working or are exhibiting diminished capacity except when it is the result of a manufacturing defect.

I truly hope this helps.

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corey fogel さん、ありがとうございました!
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