MacBook Pro 2020 Battery Draining While Plugged In

Cleo Puppy Said:

"MacBook Pro 2020 Battery Draining While Plugged In: [...]I had a 2015 MacBook Air before and it never did this, even when the battery was going bad. Thanks!"

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Troubleshooting Mac Battery Drain:

Note that all batteries are prone to failure. So, eventually, the Battery Health will cease and it will be time for a new one. Go here: Check the Condition of your Mac Laptop’s Battery - Apple Support

Try a New Charger:

If it is charing from an external device, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the Right Power Adapter and Cable for your Mac Notebook - Apple Support

A Few Links to Refer to Power:

• If your Mac doesn't Turn On - Apple Support

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

The only way to know for certain what is going on is to take the Mac in for evaluation.

The problem may very well be that the battery is failing. Keeping the computer plugged in all the time is to invite premature failure of the battery. It needs to be exercised off the charger to keep the health up. And being that you got this computer second hand, there's not telling exactly how well or poorly the battery had been treated before you got it.