Pulse 3 not charging even after battery replacement

Hello!
Anyone has any idea on how to fix a blinking red light when charinging a JBL Pulse 3.

I have swapped the battery for a new one but it just keeps blinking a red light when the charger is plugged in and won't turn on. There is also a high-pitched sound when it's connected to the charger but that might be a normal electronic whine.