Regarding the lifespan of the batteries on Bluetooth headphones like the ATH-M50xBT, it's important to note that the batteries are built-in and not replaceable. The exact battery life will depend on factors such as usage, volume levels, and whether noise cancellation is enabled. On average, you can expect the battery to last around 30 hours on a full charge. It's a good idea to recharge the headphones regularly to ensure they are ready for use when needed.
