This is inaccurate.
iFixit's batteries are not OEM. They are actually of the same quality or better.
Unless otherwise specified, the batteries iFixit that sells are made to the same specifications as an Apple OEM part, but cannot be classified as 'OEM' because they are not made by Apple.
For iFixit's definition of what makes a part OEM, see
here.
(Apple doesn't like to sell their OEM parts to just anyone, so they are extremely hard to find.) iFixit's parts are brand new, fully tested, and are held to higher standards, specifically
iFixit Quality.
All of iFixit's batteries come with a 1-Year Warranty as well, which is nice.
With this quality in mind, It is
significantly more affordable to buy an iFixit battery replacement kit and do it yourself, in comparison to taking it to an Apple repair shop to repair it. (A $20+ difference.)
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iFixit batteries are actually quite amazing and held to great quality control standards.
iFixit's parts are brand new, fully tested, and are held to higher standards, specifically
iFixit Quality. All of iFixit's batteries come with a 1-Year Warranty as well, which is nice.
(Apple doesn't like to sell their OEM parts to just anyone, so they are extremely hard to find.)
Unless otherwise specified, the batteries iFixit that sells are made to the same specifications as an Apple OEM part, but cannot be classified as 'OEM' because they are not made by Apple.
For iFixit's definition of what makes a part OEM, see
here.
With this quality in mind, It is
significantly more affordable to buy an iFixit battery replacement kit and do it yourself, in comparison to taking it to an Apple repair shop to repair it.