Nearly half a million portable power banks are being recalled because they can overheat and pose the risk of a fire while phones are plugged in, officials said.

NEW YORK (AP) — About 429,000 portable power banks are under recall because they can overheat and potentially catch fire while charging phones, posing a burn hazard to consumers.

At least six minor burn injuries were reported and 51 reports say the lithium-ion battery overheated, expanded or caught fire while users were charging their phones.