How well are the 3rd party replacement batteries aging? - MBP

I completely agree with @John Galt. The quality of third party Lithium-ion batteries is extremely poor even when purchased from a reputable vendor such as OWC. Every battery even from the same vendor can vary in quality. I personally will always choose an OEM original battery if at all possible because of how difficult it is to get a good third party Lithium-ion battery. I should know since I am responsible for keeping thousands of our organization's laptops working over the years. Sometimes you will get very good third party batteries, but the odds are against you.

It is also very difficult to remove the old battery safely in a Retina laptop without damaging the laptop or the battery. Plus you will be responsible for safely storing & recycling the used battery. Keep in mind the battery is very fragile and easily damaged since it is only held together by very thing mylar flex cables holding each cell together. The battery covering is just a piece of mylar which offers little protection to the battery cells which can cause a fire if the battery cell is punctured or if the battery is otherwise accidentally damaged. The glued in battery has not protective hard case like the older batteries in the non-Retina models.

That being said, OWC is your best option for getting a decent third party Lithium-ion battery. But you may not be saving any money in the end if this battery has problems.

Good luck with whatever you choose.

You can go as high as 1000 cycles before you need to replace it. Other than that ,Try OWC Computing.

https://eshop.macsales.com/shop/laptop-batteries/macbook-pro

If you hold down the option key while checking on the battery icon, it will tell you if the battery is good ,failing or dead. Should say condition normal.

If you have the 13" 2015 MBP the battery is extremely difficult to replace. It requires major disassembly, the battery cells are glued in place and it's a potentially dangerous operation (both to you and your MBP). A battery replacement kit from iFixit or OWC will cost $95-$130 and you still have to do the work yourself and take all the risks.

I strongly recommend that you have it done by Apple or an Apple Authorized Dealer. The $199 USD cost is well worth it.

You may regret the attempt. The cost can be a Mac that will not work and Apple will refuse to service.

Learn what you're getting into first. OWC is the only vendor I would comfortably recommend, but even OWC "recommends that this battery replacement be performed by a trained professional."

The only reason to install an aftermarket battery is if you have literally no other choice, which is not the case with your Mac.

Mac Repair - Official Apple Support