2.3GHz, 2.6GHz, or 2.7GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.7GHz) with 6MB shared L3 cache.

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Slow performance after battery replacement

I recently replaced the battery on my 15" Mid 2012 RMBP. I'd installed a clean version of High Sierra before installing the battery. Since replacing the battery, the performance fo the Mac feels a but sluggish, glitchy almost.

Here's what I did:

Tried resetting the SMC - which didn't seem to even work properly. The light on the power cord didn't blink to indicate anything had happened.

Startup progress bar also seems to stall for a noticeable 5-10 seconds now, about 3/4 of the way through. Not a killer, but a noticeable difference.

Any thoughts are appreciated.


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Sometimes faulty batteries can cause Cpu throttling. I'd suggest trying unplugging the battery connector and check how the laptop behaves with Dc in only. If everything gets back to normal, it might be just a faulty battery problem.

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Oh man ...

If this turned out to be a faulty battery from iFixit I might flip my top. I can’t imagine having to do that replacement again.


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I had to remove the battery and I'm also facing the CPU Throttling.

My CPU should run at 2.3ghz, but Intel Power Gadget and Windows Task Manager shows it running at 1.1ghz.

My new battery should arrive next month, I'll post the results when I get it.

If you have any progress please share with us.

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Zach MacDonald estará eternamente agradecido.
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