I got this strange battery important message on MacBook Air (13-inch, early 2015) with macOS big sur.

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.

Find an Apple Authorized Service Provider . Especially when getting the Message Service Battery is involved.

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 If battery charging is paused or on hold on your Mac

A feature introduced into Big Sur was to preserve the number of Full Battery Cycles - there was an Algorithm coded into the macOS. It is perfectly Normal for Big Sur 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%

RestInPeacePeely wrote:

so, my battery acts completely normal. there's nothing wrong with it. but I got this error, that the battery needs service.

https://discussions.apple.com/content/attachment/4461d6c1-3f73-493f-832d-fd10c0ddc934

You may say "completely normal" and this may be true, however your macOS thinks there is an issue with the battery—

You can run a Diagnostic test- and see if it kicks out an error code.

Use Apple Diagnostics to test your Mac

https://support.apple.com/en-us/HT202731

The resolve take it and have it tested/ repaired especially if you are under warranty:

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

Outside the USA

https://locate.apple.com/country

RestInPeacePeely ~ Some things to be aware of regarding aging batteries in MacBooks...

Aging batteries can expand and damage the trackpad. Signs of battery expansion are that the MacBook may wobble on a flat surface and the trackpad may fail to register clicks.

Also, older replacement parts such as the battery and possibly its attached aluminium "top case" may be difficult to obtain.

After six years, my MBPro 15" late 2013 had all the above issues but I put off having the battery replaced for a further year. For that particular model the "top case" had to be replaced along with the battery.

...So consider the above when weighing the decision of whether to replace your aging battery now or later.

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