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>Mine no longer holds a charge

That should be trivial to fix with a battery update. 5-6-7 years is a good run...

We got a SIKER battery replacement for a 2012 MacBook Pro, but one cell swelled up and the battery wouldn't hold a charge. One Amazon reviewer for one of the replacement MacBook battery packs says that they might be building replacement battery packs out of old worn damaged, or mismatched cells. I don't know if that's the case.

In any case I bought a second battery pack from TECHOWL and it seems to be working for a few weeks so far. Fingers crossed...

I’ve changed half a dozen MacBook batteries with Anker over the years, and all worked flawlessly. One I thought was swollen and they promptly moved to send a replacement, but turned out it was my case that was warped.

I remember when they were making cell phone battery replacements (when that was a thing) -- are they still doing this with laptops today?

my older macbooks (air and pro) had a swollen battery which ruined the main boards and were no longer replaceable in practical terms. I'd get it replaced sooner than later if you're planning on doing so.

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