Marshall Reintroduces Replaceable Battery in Portable Speaker as Industry Shifts Toward Sealed Design

Marshall's Stockwell III portable speaker ships with a user-replaceable battery and 40-hour runtime—double the predecessor's 20-hour rating. At $249.99, it breaks from industry convention; competitors like Sony, JBL, and Bose seal their devices to prevent field service. The modular approach lets users swap degraded cells rather than discard a functional speaker, extending lifespan and reducing e-waste.