Reported risk: This recall involves Denon's HEOS 1 Go Pack lithium-ion rechargeable battery packs for wireless speakers. Only HEOS 1 Go Packs with a 10-character alpha-numeric serial number beginning with 5 or 601G91 and ending with 3517 through 4004 are included in the recall; the battery packs are black or white, hexagon-shaped and have four blue LED lights and a power button. HEOS, the model and serial numbers are printed on the bottom. Only the speaker battery is being recalled. Hazards: The battery can overheat, posing a fire and burn hazards
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