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2.2 GHz (Turbo Boost up to 3.4 GHz) or 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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Can I run MacBook Pro without a battery?

The replacement battery in my older MacBook Pro (Retina, 15-inch, Mid 2014) is failing. It is not yet overheating or swelling. I've researched the replacement process here and concluded that it is more than I care to undertake. I suspect that the replacement battery now in the device was inferior and the guy who replaced it is now out-of-business. I am nowhere near an Apple Store. I now use the machine largely for internet browsing and viewing documents. I have an iMac for more demanding work.

I am, therefor, wondering it would be possible to remove the battery before it creates problems and run the machine via AC power?

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Not really, if you take the battery out the systems SMC logic will go into CPU Safe Mode lowering the CPU’s clocking and pump up the fans.

I think you’re worrying a bit too much, if you take it out putting a new one in isn’t much more. Follow the guide here MacBook Pro 15" Retina Display Mid 2014 Battery Replacement and for $85 USD you can get a good replacement MacBook Pro 15" Retina (Late 2013-Mid 2014) Battery with the tools which are needed! If you have what you need $77 for the battery alone.

I’m sure you can do it, more so as you stated the system is on its second battery, I often find the replacement are much easier to replace than the original as Apple really glues them in.

crwdns2886500:0Replace a 8700 mAh battery compatible with MacBook Pro 15" Retina (Late 2013/Mid 2014). 98 Watt Hours (Wh), 11.26 Volts (V).crwdne2886500:0

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MacBook Pro 15" Retina (Late 2013-Mid 2014) Battery

$89.99

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