A battery in the left cup and separate ear cushions, speakers and headband parts give the XL several documented repairs.
What to check before buying
Battery and cushions
Fairphone's instructions cover battery access in the left cup and tool-free twist-and-click ear-cushion replacement. The speaker units are also separate parts.
Wired use and revisions
USB-C wired audio can work without a charged battery, though some functions may not work if the battery is physically removed. The 2023 and 2025 headband assemblies use different replacement guides.