How to troubleshoot when MacBook Pro battery isn’t working properly?

If the battery is not performing to your expectations, then check if the Battery condition is listed as "Service Recommended". If so, then the battery should be replaced since it is not performing to your expectations.

If the Battery condition is listed as "Normal" (or doesn't show any condition....implies "Normal") and the battery is three years old & not performing to your expectations, then it is still possible the battery may have a hardware issue. You can try running the Apple Diagnostics to see if any hardware issues are detected, however, this probably won't detect any issue if the Battery condition is "Normal", but it never hurts to try.

I have developed a method of testing my organization's batteries which otherwise appear "good" to macOS & Apple Diagnostics, but it is tricky to explain & interpret the results. You can see what the third party app Coconut Battery has to say about your battery's condition....I haven't used it enough on my organization's Macs to see if it reports issues when macOS says everything is "good". Unfortunately Apple won't use its status to confirm a battery only repair.

Hopefully the battery condition is "Service Recommended" so that Apple will easily replace it for you (for a fee), otherwise it can be hard to have Apple perform a battery only repair unless the service diagnostics report a problem since Apple techs are not trained to look closer at the battery to see some failures (Apple probably wouldn't allow them a battery only repair anyway since Apple has strict rules on it due to the battery being part of a much more expensive part).

MacbookProBattery wrote:

How to troubleshoot when macbook pro battery isn’t working properly? Is it necessary to change the battery right away even if it’s only three years old now since it was purchased? Is there any effective way to make the battery working again? I really appreciate all the information that might be helpful. Thank you in advance.

The rule of thumb—if you are near the mains leave it plugged in, if you need the portability then run on the battery only—this is how you help optimize your battery charging and extend the working life of your battery by reducing the cycle count.

Get help with your Mac notebook battery

Learn how to optimize the life of the battery in your Mac notebook, fix battery issues, and get service.

If you see Service Recommended on your MacBook Air or MacBook Pro - Apple Support

Check your coverage

My Support - Official Apple Support

You have an expected 1000 cycle count...

Determine battery cycle count for Mac notebooks

Determine battery cycle count for Mac laptops - Apple Support

About BHM battery health management:

M1/M2/M3 SoC

About battery health management in Mac notebooks - Apple Support

Intel

About battery health management in Mac laptops - Apple Support