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Computer shutsdown under heavy load after reaching 45ºC

I recently replaced my old battery to a new A1494 one from ifixit but the computer started doing some weird shutdowns.

At the beginning I tried re-calibrating and I have done it twice. Full charge and then wait ~6h and full discharge and wait overnight (I know it is supposed to be +2h, but at this point I rather make sure it did calibrate). This didn't solve the issue so I then did a PRAM reset followed by an SMC one. Didn't work either.

Then I started realizing that the computer would shutdown under heavy loads (~80W, I just let a program running in a loop, turn the fans to the maximum and run a video on youtube) and reaching 45ºC and then shutdown because of it. Here's a screenshot:

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This problem doesnt happen with the old battery. It doesnt even reach the >45ºC under the same load.

Anyways, I already asked ifixit for a replacement battery, but I'm afraid it doesnt work as I saw a thread where the guy replaced the battery 3 times and it didn't solve the issue until he went to an official apple store to make the replacement.

Do you guys ever experienced something similar and were able to fix it? The computer is almost 10 years old and never stopped working properly, I just wanted to replace the battery to make it last longer as the current one ist at 50% of the design capacity.

Thank you!

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Computers shut down because of high CPU temperatures, not battery temperatures. They won't run under heavy load for long if the airways are dirty. Try blowing it out and find an app that monitors CPU temps.

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Hi Bill, although I agree with you I don't think that's the case here. I already monitor the CPU temperatures and they seem to be normal. In any case, this issue doesnt happen when I put the old battery back, in fact, the old battery goes up in temperature way slowly and never reaches >40ºC for the same exact load. My theory is that the BMS shuts down the battery (and the computer) when it reaches high temperatures and either the sensor is faulty or the cells really go up to those temps.

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well, if you are monitoring CPU temp u are probably right. If the Li batteries get too hot, it should shut down. I never had it happen but any device with Li batteries should do the same thing including chargers that monitor temps.

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How about installing a good thermal monitoring app like TG Pro it will allow you to see clearly what’s happening and given your issue I would recommend getting the full version so you can enable logging which should capture the point of shutdown.

You can also try pressing the fans a bit with higher RPMsto see if that alters things.

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