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Samsung SDI Co. Ltd. has escaped a lawsuit over a vape battery explosion that severely injured a teenager, after the Seventh Circuit ruled Wednesday that the South Korean company never purposefully entered the retail vape battery market — a decision that underscores the razor-thin legal boundaries of product liability and jurisdiction.

In a 3–0 ruling, the court affirmed the dismissal of the suit brought by a minor known as B.D., who suffered third-degree burns and required skin grafts after a lithium-ion 18650 battery exploded in his pocket. The judges found that Samsung’s ties to Indiana weren’t close enough to justify the case being heard there.

The Burn, the Battery, and the Blowback

The injury occurred when B.D.'s stepfather bought a loose 18650 lithium-ion battery from a vape shop. The battery, manufactured by Samsung SDI, combusted spontaneously while in the boy’s pants pocket — a malfunction that landed him in the hospital for three weeks.

But the court wasn't swayed by the tragedy alone. Despite the physical pain and financial damages, the key legal question was: Did Samsung SDI purposely make its way into the Indiana vape market where the battery was sold?

The panel said no, drawing a bright line between the company’s approved distribution network — which supplies batteries to be used inside battery packs for devices like laptops and power tools — and the aftermarket, loose-battery market where the explosive unit was sold.

"Two Streams of Commerce" — One Legal, One Rogue

The ruling hinges on the legal concept of “streams of commerce.” While Samsung SDI does sell battery cells into the U.S. market, it does so exclusively for integration into larger, pre-approved devices. The company actively prohibits the sale of individual batteries to retail customers. Buyers must go through an application process, specify their intended use, and acknowledge that loose batteries should not be sold separately.

"This isn't splitting hairs," the panel wrote. "A single forum can implicate two streams of commerce — one the defendant navigates deliberately, and one it avoids."

In other words, the vape shop’s decision to stock the battery was a “unilateral action by an unknown third party”, and Samsung SDI could not be held accountable in Indiana simply because its batteries ended up there through unauthorized channels.

A Warning Shot on Jurisdiction

B.D.’s legal team argued that Samsung’s national distribution was enough to create jurisdiction anywhere its products surface. But the judges disagreed, warning that such logic would blur the critical line between general jurisdiction (being sued anywhere) and specific jurisdiction (being sued where the company directly operates).

“Accepting this theory,” the court said, “would effectively erase the limits on jurisdiction that the Supreme Court has emphasized.”

The Legal Teams Behind the Bench

Representing Samsung SDI were Dina M. Cox and J. Neal Bowling of Lewis Wagner LLP, while Jonathan E. Taylor of Gupta Wessler LLP stood for B.D.

The panel of judges included Chief Judge Diane S. Sykes, Judge Michael B. Brennan, and Judge John Z. Lee — all aligned in the decision to keep Samsung out of Indiana courtrooms on this matter.

As for public comment? Silence so far. Neither party responded immediately Friday.