Self-balancing "hoverboard" scooters, once lauded as trendy electronic skateboards, are now the subject of an ongoing safety investigation in the United States. Some online retailers are pulling certain brands off their virtual shelves following several incidents in which the futuristic devices caught fire or exploded. But it's likely not the boards themselves that are causing these flare-ups, but rather their energy sources: shoddily made lithium-ion batteries, experts say.
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