Low battery level warnings causing unreliability and creating uncertainty

ambience22 Said:

"Low battery level warnings causing unreliability and creating uncertainty: […]This has not created any real problems yet, but the uncertainty in my mind about the Mac's reliability is, well, not comfortable. […]Thanks for replying. You think replacing the battery is the only option, and not some update to software?”

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You are welcome.

Back Up, then Upgrade the macOS:

Updating may fix some inconsistencies and add features to optimize the Mac‘s battery charge. So, back up and the perform the update. Here is how to check for updates and install them...

Updating the macOS:

Determining which Update(s) will Install:

I. Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• macOS Ventura is Compatible with these Computers - Apple Support
• macOS Monterey is Compatible with these Computers - Apple Support
• macOS Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - Hardware Requirements - Apple Support
• macOS Mojave 10.14 - Hardware Requirements - Apple Support
• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support
• OS X El Capitan 10.11 - Hardware Requirements - Apple Support
• OS X Yosemite 10.10 - Hardware Requirements - Apple Support

III. If Compatible:

Back Up your Mac First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.

ambience22 Said:

"Low battery level warnings causing unreliability and creating uncertainty: Would the battery require repair or is there something simpler I can try first? Perhaps I mean "cheaper"! The Apple Support site provides an estimated cost to repair of more than $400 (AUD, shown as A$).[...]"

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Where to get a New Battery iPhone:

Getting a New iPhone Battery:

Contact Apple, and setup a Genius Bar Appointment or see an AASP (Apple Authorized Service Provider) in your local area. Be wary as to where you get this item, ask you may get an error of an ungenuine battery. So, to avoid this continual message, it is best to have an Apple or an AASP replace the battery. So, where to get a new battery:

A. Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :) 

B. Contact an AASP: 

1. Go Here: Find Locations - Apple Authorized Reseller
2. Click: Service & Support
3. Enter: your location information
4. See: if there is an AASP nearby
5. Contact: an AASP that shows up, and find out more about the services that they offer to fix the battery