MacBook Pro M1 draining battery fast when shutdown/ in sleep mode

Hi Sracasanu,

Thanks for coming to Apple Support Communities for help today.

While what you are describing may not be out-of-the-ordinary, you can run diagnostics to make sure your battery is working correctly, as well as other hardware in the Mac. Here's how: Use Apple Diagnostics to test your Mac.

"Prepare your Mac

1. Shut down your Mac.
2. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
3. Make sure that your Mac is on a hard, flat, stable surface with good ventilation.

Apple silicon

1. Turn on your Mac and continue to press and hold the power button as your Mac starts up.
2. Release when you see the startup options window, which includes a gear icon labeled Options.
3. Press Command (⌘)-D on your keyboard.

Intel processor

1. Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up. 
2. Release when you see a progress bar or you're asked to choose a language."

Any codes thrown in this process will be found here: Apple Diagnostics reference codes.

Also the tips found here may help you conserve the battery: Get help with your Mac laptop battery. This tip seems particularly relevant to your situation.

"Turn off “Enable Power Nap while on battery power.” This setting prevents your Mac from checking for mail or other iCloud updates during sleep which improves standby time."

Have a fantastic day!

Sracasanu,

To help with the battery charging slow, you can check to see if optimize battery charging is enabled. This may cause the battery to charge slowly. Take a look at the guidance below for more information:

1. Choose Apple menu  > System Preferences.

2. Click Battery, then select Battery in the sidebar.

3. Deselect "Optimized battery charging", then click Turn Off or Turn Off Until Tomorrow.

This information is from If battery charging is paused or on hold on your Mac - Apple Support.

Take care.