MacBook 2015 not recognizing battery

Hey! I booted my parents' old 2015 13-inch Pro and realized the battery was stuck at 1% and wouldn’t charge. It had 283 cycles and normal health. After an SMC reset, the battery icon briefly showed an X and then disappeared from the menu bar and system preferences. Now, it only boots with the MagSafe (red light) and shuts down if I unplug it.

Here’s what I tried:

• SMC reset
• Reconnecting the battery on the motherboard
• Charging overnight
• Checking if I could enable the battery icon on system preferences via the personalize menu

One think kinda worked: I've read on reddit something called SMC "bypass" (holding the power button for 5 extra seconds during an SMC reset). It boots with fans at max and works on battery, but there is still no battery in the UI (system preferences, menu bar).

Do you have any ideas before I consider replacing the battery? It’s running Monterey. Thanks!

Hey! Thanks for answering!

Here is the screenshot from coconut:

https://drive.google.com/file/d/1PnmcAZU...

But like I said, it doesn't recognize the battery at all. It behaves like it is disconnected even if I go to the SMC bypass mode and it works with the battery/without the magsafe plugged in.