Battery death after Big Sur 11.6.1 update

Start with the SMC Reset and perform this action three times consecutively

Then, perform the Reset NVRAM or PRAM on your Mac and perform this action three times consecutively.

The test if the issue persists.

Should it still occur - Go About this Mac >> System Report. Scolls down to Battery and see how many Full Battery Cycles are reported.

Batteries are considered Consumable Products. Over time it will degrade to a point where it needs to be replaced. The usage is normal as the capacity will go up and down all the time and never stay always at 100%. Apple Batteries are rated for 1000 Full Battery Cycles and / or 80% Capacity before needing Evaluation or replacement.

For additional reading on Battery and Apple Computers this link may help. About battery health management in Mac notebooks and especially for the M1 and Big Sur  & Monterey If battery charging is paused or on hold on your Mac

Depending on the Age of the computer, some aspects from the above links, may or may not apply to your computer.

A feature introduced into Big Sur & Monterey was to preserve the number of Full Battery Cycles - there was an Algorithm coded into the macOS. It is perfectly Normal for Big Sur , Monterey to Pause / Suspend charging the battery beyond 80% and hold it at that level. One can nudge / over-ride this by clicking the Battery Icon on Desktop Top Bar and allow charging beyond 80%. From observations, it will Pause / Suspend again once reading 90%. Same procedure to over-ride and will charge to 100%

Computer as stated is a 2013 to 2021 - 8 year old battery.

In all probability, the battery has either failed or is basically unable to hold a charge.

Find an Apple Authorized Service Provider and have it evaluated and / or serviced.

How may Full Battery Cycles on are the battery ??

Apple Logo on Top Left of Screen >> About is Mac >> System Report >> Battery section on left and look on right. Should indicate the requested information.

If above is close or above 1000 - that question was answer earlier.

As evidenced by your description - the computer shuts off the moment the charger is removed - that too is a very real indication the battery can not hold a charge.

As to the cause - that too was answered earlier Computer as stated is a 2013 to 2021 - 8 year old battery.

Batteries are considered Consumable Products. Over time it will degrade to a point where it needs to be replaced. The usage is normal as the capacity will go up and down all the time and never stay always at 100%. Apple Batteries are rated for 1000 Full Battery Cycles and / or 80% Capacity before needing Evaluation or replacement.

Further, if one believes the upgrade to Big Sur 11.6.1 was the root cause of the battery failure, there is noting that can be offered to convince one differently except to have the Computer Service by an Authorized Service Centre.

peachybrets wrote:

It turns out that my battery cycle count is only at 323, normal condition. It is not fully charged and also not charging. State of charge is at 98%

P. Phillips is correct, if you disconnect from the power supply and the battery cannot hold a charge or provide power, the battery is probably worn out. Batteries can wear out from exceeding their lifetime of cycles (e.g. > 1000 cycles), but they also wear out from being connected to a charger most or all of the time as well. This means if enough time goes by, your battery will likely wear out one way or another. 8 years is longer than most laptop batteries last.

When you bring your laptop to an Apple certified service provider, before replacing the battery they will test it and your Mac to make sure the battery is the problem, versus some other circuitry in the Mac. If it is just the battery, that is straightforward to replace (and relatively low cost as well).

I doubt the update damaged your battery, that this happened at about the same time is probably a coincidence.

spinabout wrote:

my computer is running VERY SLOWLY since the download of Big Sur. Can I go back to the previous operating system?

Suggest that you start and post a new separate query about your issue, it sounds different from this one.

There is the answer - does not list at all - Failure - dead

For definitive verification - scroll down Power section and check their too for Battery and Full Battery Cycles.

my computer is running VERY SLOWLY since the download of Big Sur. Can I go back to the previous operating system?