Why won't my headphones power on?

My Bose SoundLink OE headphones suddenly stopped working one day and became unresponsive even when powered on. When I plugged it in to charge it, it would work again, but only plays for a little bit before suddenly failing (the battery and bluetooth indicators go blank and the power switch stops working).

Does this sound link something internal that I can fix? I have opened up the right headphone looking for any issues but from my untrained eye the circuitry looks fine. No water damage/food from my memory. Photos of the right headphone are below: