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Repair guides and disassembly information for the MacBook Pro 16'' released in November of 2019. Model A2141, EMC 3347.

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MacBook does not enter safe sleep after battery replacement.

Hi all

I recently got my MacBook battery replaced and an aftermarket battery was used. It works and powers on the computer but for some reason, when the battery reaches 0%, it just stays there and when the computer shuts off, it doesn't enter safe sleep. Instead, the computer just shuts off. And when I push the power button, I don't even get the low battery icon or any fan spin it's just dead. After plugging in my computer, instead of resuming where I left off like with my old battery, all the apps have to reopen from the start.

I would have expected it to hibernate or enter safe sleep upon low battery percentages like with the factory battery.

Is this something that should work or is this just a limitation of aftermarket batteries? Maybe the aftermarket battery I have isn't the best as it's shown 89.5 degrees and never changed. On a different MacBook I had, I got an egoway battery for my 2015 MacBook Air and safe sleep was supported. Or is this just a defect with my battery?

I already did the whole SMC/PRAM reset stuff and I got the same thing. Or should I calibrate it one more time and see what happens?

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There are 3 or 4 files under library/Preferences/ com.apple.Power*, delete them, empty the trash, restart, did that make any difference?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Your batteries temp is a bit high, are you running a heavy process game or video rendering?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@danj No it's right after power on. I don't think the battery sensor is working as it's been showing 89 degrees regardless of the condition so might be an aftermarket battery quirk.

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@livfe I did a clean install then attempted to calibrate the battery. I viewed all those files and they are essentially blank.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@jimmysofat6864 - That's not good 😡 best to get it replaced under warranty I hope!

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Your issue likely stems from the aftermarket battery’s firmware or sensor limitations. Many third-party MacBook batteries lack proper communication with the SMC, causing incorrect temperature readings and disabling safe sleep or hibernation functions. Since your Mac shuts down instantly at 0%, the system doesn’t receive proper low-battery signals. Calibration might slightly help, but it won’t fix firmware-level compatibility. To restore safe sleep and accurate reporting, you’d need a high-quality, SMC-compatible replacement (like iFixit, NuPower, or Egoway). In short, it’s a limitation or defect of the current aftermarket battery, not a macOS or SMC issue.

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I am not sure if even iFixit batteries support safe sleep because I've seen other users with an iFixit battery with the same issue as me.

MacBook does not enter sleep on low battery after battery replacement

MacBook does not enter sleep on low battery after battery replacement

My MacBook Pro doesn't enter in sleep mode with low battery

It seems like NuPower makes one for my computer so that might be what I go for next.

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@jimmysofat6864 - I wouldn't be to quick here as the OP's never told us what happened in the end. There was likely a change in the supplier which might explain the issue. Please contact the iFixit Store folks if you bought the battery from them.

There is nothing special in the battery to support safe sleep.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@danj In the first link I shared, the OP did contact iFixit and got a replacement battery and had the same issues as me. It could be that the battery doesn't support safe sleep and doesn't send the correct data to support safe sleep or apple is doing something to make sure that safe sleep only works with their batteries but that's just speculation.

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@jimmysofat6864 - I've used iFixit batteries in the 2015 15" MacBook Pro's with no problems! The first link looked more like a SMC issue within the charging logic. But that's not your system here which is a 2019 16". Different series do have differences. So one can't assume what was a problem before is the same issue here. While I hear you the safe sleep is an issue here do you understand how it works? Here's a good write up Set sleep and wake settings for your Mac there are some differences in the old macOS's so alter the OS info to dial into your version. To be clear here the only thing related to the battery is if there is enough power depending on what is set within SMC for thresholds.

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