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battery dies after big sur update

I have a 2013 macbook air. I have a nearly new apple battery with only 120 cycles. Before I upgraded to Big Sur it took a full charge, the design capacity was 100% and I got 9-10h of battery life. I upgraded to Big Sur and IMMEDIATELY my machine told me the battery needed replacing. Also the design capacity had dropped to 80%. With each successive charge the battery design capacity dropped by about 5%. Also, the battery would run down to about 30% very quickly and then drop to 7% to 2% in the blink of an eye and die. I ran through all the diagnostics, did the SMC and PRAM resets etc but nothing worked. I finally uninstalled Big Sur and downgraded to Mojave. My battery however is still wrecked. According to coconut battery my mac OS battery status is GOOD and sitting at 130 cycles. Full charge capacity however is only 1549mAh instead of 7150 mAh and the design capacity is sitting at a lowly 21%. I'm I'm lucky I get 70min os use now on my battery. Thanks BIG SUR! Does anyone have any REAL solutions to this issue. Please don't offer me any of the 'excuses' that Apple has in terms of letting the battery drain fully and recharging it or the SMC reset stuff. None of it works. Please also don't suggest that it's a coincidence that my battery is wrecked after installing BS because it's not. This is a 6 month old Apple battery that was noticeably problematic immediately after installing BS. Thanks in advance for your advice.

Posted on Jun 30, 2021 3:12 AM

Top-ranking reply

dominic23

Level 10

83,964 points

Posted on Jun 30, 2021 4:27 AM

1. If your Mac battery runs out of charge quickly

2. Startup in Safe Mode. https://support.apple.com/guide/mac-help/start-up-your-mac-in-safe-mode-mh21245/mac.

Quote:

It also does a basic check of your startup disk, similar to using First Aid in Disk Utility.

And it deletes some system caches, including font caches and

the kernel cache, which are automatically created again as needed.

3. Battery Management.

How battery health management helps

The battery health management feature in macOS 10.15.5 is designed to improve your battery's lifespan

by reducing the rate at which it chemically ages.

The feature does this by monitoring your battery's temperature history and its charging patterns.

Based on the measurements that it collects, battery health management

may reduce your battery's maximum charge when in this mode.

This happens as needed to ensure that your battery charges to a level that's optimized for your usage

—reducing wear on the battery, and slowing its chemical aging.

Battery health management also uses the measurements to calculate when your battery needs service.

https://support.apple.com/en-us/HT211094?cid=mc-ols-energy_saver-article_ht211094-macos_ui-04022020

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battery dies after big sur update

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