Bose has announced a recall of more than 670,000 lithium-ion battery packs used in its S1 Pro and S1 Pro+ Bluetooth speaker systems, citing overheating concerns. The company has received reports of the batteries overheating, melting, emitting smoke, or catching fire, though no injuries have been reported so far. The recall applies to battery packs with serial numbers containing one of six specified six-digit numbers. These batteries were sold with the affected speakers and accessories between December 2017 and July 2026, with 634,759 units sold in the U.S. market and 35,400 units in Canada. Bose is urging affected users to stop using and immediately remove the batteries in question; the speakers themselves can still be used with AC power. After submitting their serial number for registration, users can receive a free replacement battery. The old battery must be safely disposed of according to instructions through their local municipal household hazardous waste collection center.